2004 GMC Envoy XL Ignition and Tune-Up Products

Essential 2004 GMC Envoy XL Ignition and Tune-Up Products

Carquest Premium – Ignition Coil Connector (Part No.PTA1566)

Ignition Coil Connector

from

$19.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.

Product Features:
  • Premium quality materials for longer service life
  • Sealed connections (where applicable) to prevent environmental corrosion and performance issues
  • Global coverage for import and/or domestic applications
  • OE specified wire gauge to ensure a reliable electrical connection
  • Designed to meet or exceed OE specifications in form, fit and function
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NGK – NGK Wire Set (Part No.51436)

NGK Wire Set

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$78.99
NGK ultra-low resistance mag core wire sets provide outstanding performance and durability. High-temp premium silicone outer jacket and inner EPDM/silicone insulation contain high voltage currents for excellent dielectric strength. Stainless steel winding

Product Features:
  • PERFECT FIT FOR YOUR VEHICLE: Built to OEM tolerances with OE quality or better materials
  • BUILT TO LAST: Outer Jacket built to withstand temperatures greater than 250 degrees C, inner insulation EPDM or silicone for best dielectric strength
  • STAINLESS STEEL TERMINALS: Provide the highest possible retention to ensure positive connections through the life of the set
  • CYLINDER LEAD ID: Cylinder lead identification tags where possible make installation easier
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Carquest – A/C Compressor Connector (Part No.PT770)

A/C Compressor Connector

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$16.05
BWD is an aftermarket leader, providing a premium line of engine management products. BWD manufactures and distributes high technology critical components for late model domestic and import vehicles. BWD is constantly evolving to give customers the competitive edge they need to compete in today’s ever-changing marketplace.

Product Features:
  • Our knock sensors are designed to respond to knock frequencies up to 1000 Hz accommodating shifts in engine knock frequency making it a more flexible sensor responding to correct engine knock over a broad range of vehicle conditions
  • Manufacturing processes include an automated data acquisition system to continuously monitor the sensor output to ensure that it responds with appropriate voltage output at the specified frequency range
  • All units are 100% tested using an accelerometer vibration test to ensure trouble-free operation
  • Featuring the broadest sensor coverage in the market, we meet the service professionals needs with the highest quality product every time he opens the box
  • BWD is a global manufacturer of original equipment ignition products, complete quality control is maintained through the manufacturing process from componentry to finished product
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Carquest Premium – Ignition Coil Seal (Part No.FAA1099)

Ignition Coil Seal

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$18.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.

Product Features:
  • Designed to match OE in form to ensure proper, trouble free fit
  • Premium quality materials for longer service life
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Carquest – Cornering Light Socket (Part No.PT189)

Cornering Light Socket

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$23.29
BWD is an aftermarket leader, providing a premium line of engine management products. BWD manufactures and distributes high technology critical components for late model domestic and import vehicles. BWD is constantly evolving to give customers the competitive edge they need to compete in today’s ever-changing marketplace.

Product Features:
  • Our control modules feature double wire bonds for better connections, greater dependability and longer life despite being subjected to intense vibration and the tough operating environment
  • Copper slug heat sinks provide better heat dissipation to prevent heat from damaging the module
  • Our ignition modules will respond to a weak signal from the crankshaft position sensor and begin energizing the coils immediately for better starts in cold weather
  • High-temperature polymer housing reducing moisture intrusion and minimizes vibration damage for extended life and improved reliability
  • Our ignition modules are durability tested for 500 thermal cycles ranging from -40C to +125C
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GM Genuine Parts – Fuel Injection Fuel Rail Bolt (Part No.12554211)

Fuel Injection Fuel Rail Bolt

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$9.99
GM Genuine Parts Studs are designed, engineered, and tested to rigorous standards, and are backed by General Motors. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

Product Features:
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
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Dorman – Help – Knock Sensor Grommet (Part No.42003)

Knock Sensor Grommet

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$14.99
This ignition knock (detonation) sensor seal is designed to match the fit and function of the original seal on specified vehicles, and is engineered for durability & reliable performance.

Product Features:
  • Direct replacement – this ignition knock (detonation) sensor seal is designed to match the fit and function of the original seal on specified vehicles.
  • Restores functionality – reliable replacement for an original part that is leaking or has failed due to fatigue
  • Durable construction – this part is made from quality materials to ensure reliable performance and long service life
  • Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
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MSD Ignition – Coils; Street Fire; GM L-Series Truck 99-07; 8-Pack (Part No.55098)

Coils; Street Fire; GM L-Series Truck 99-07; 8-Pack

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$471.99
MSD Street Fire coils will improve the performance of your late model GM or Ford vehicle. The E-core dual connector and TFI coils feature epoxy-filled construction and 48,000 maximum volts. They mount directly in place of the factory coil and accept the factory connectors for an easy installation.

Product Features:
  • Increased Spark Energy Over The Entire RPM Range Of The Engine
  • Coils Bolt In Place Of The Factory Units
  • Accepts OEM Connections For A Simpler Installation
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Suncore – Shock Absorber (Part No.12S251020)

Shock Absorber

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$39.99
Shock Absorber

Carquest Premium – Exhaust Gas Recirculation (EGR) Vacuum Regulator Solenoid Connector (Part No.PTA1107)

Exhaust Gas Recirculation (EGR) Vacuum Regulator Solenoid Connector

from

$24.49
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.

Product Features:
  • Premium quality materials for longer service life
  • Sealed connections (where applicable) to prevent environmental corrosion and performance issues
  • Global coverage for import and/or domestic applications
  • OE specified wire gauge to ensure a reliable electrical connection
  • Designed to meet or exceed OE specifications in form, fit and function
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Accel – Pc Wire Set 99-11 GM 8-Cyl (Part No.118064)

Pc Wire Set 99-11 GM 8-Cyl

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$68.99
Pc Wire Set 99-11 GM 8-Cyl

NGK – NGK Wire Set (Part No.51439)

NGK Wire Set

from

$78.99
NGK ultra-low resistance mag core wire sets provide outstanding performance and durability. High-temp premium silicone outer jacket and inner EPDM/silicone insulation contain high voltage currents for excellent dielectric strength. Stainless steel winding

Product Features:
  • PERFECT FIT FOR YOUR VEHICLE: Built to OEM tolerances with OE quality or better materials
  • BUILT TO LAST: Outer Jacket built to withstand temperatures greater than 250 degrees C, inner insulation EPDM or silicone for best dielectric strength
  • STAINLESS STEEL TERMINALS: Provide the highest possible retention to ensure positive connections through the life of the set
  • CYLINDER LEAD ID: Cylinder lead identification tags where possible make installation easier
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Dorman – Knock Sensor And Harness Kit (Part No.926-084)

Knock Sensor And Harness Kit

from

$94.99
Check engine light on and vehicle running rough? Could be a failed knock sensor. This ignition knock sensor kit combines both necessary sensors and the wiring harness that joins them for a complete repair in one package.

Product Features:
  • Complete solution – this knock sensor kit includes two knock sensors and the wiring harness that connects them
  • Plug-and-play installation – matches original wiring harness, requiring no cutting or splicing
  • Quality assured – benchmarked against original components for performance and quality
  • Excellent value – original equipment quality at significant cost savings
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DENSO – Spark Plug Wire Set: Aluminum Steel Core, 8 Wire Set (Part No.671-8072)

Spark Plug Wire Set: Aluminum Steel Core, 8 Wire Set

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$104.99
DENSO First Time Fit Ignition Wire Sets are identical in form fit color and performance to the factory-installed wire sets. Every part of each wire sets construction meets or exceeds OE/OES standards.

Product Features:
  • Each wire is pre-cut to exact length so the wire set is ready to install right out of the box
  • Identical OE end caps are designed to “click” into place for easy installation and a secure fit
  • Strong connections – through a patented process, the terminals are attached to provide an extremely strong connection, ensuring the cable and boot will not separate during removal and installation
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Carquest Premium – Engine Crankshaft Position Sensor Connector (Part No.PTA1136)

Engine Crankshaft Position Sensor Connector

from

$69.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.

Product Features:
  • Premium quality materials for longer service life
  • Sealed connections (where applicable) to prevent environmental corrosion and performance issues
  • Global coverage for import and/or domestic applications
  • OE specified wire gauge to ensure a reliable electrical connection
  • Designed to meet or exceed OE specifications in form, fit and function
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Carquest Premium – Coil On Plug Insulator Boot: Spring included, Designed for direct fit (Part No.35-7003)

Coil On Plug Insulator Boot: Spring included, Designed for direct fit

from

$7.99
CARQUEST Premium coil on plug boots are engineered to restore ignition boot reliability and performance. We have OE design providing an exact direct fit for your application and the performance and durability meet or exceed OE requirements. It offers excellent heat resistance as well as maximum protection against spark loss. With durable silicone compound for resistance to high heat or abrasion.

Product Features:
  • Provides excellent heat resistance as well as maximum protection against spark loss.
  • Durable silicone compound for resistance to high heat or abrasion
  • Spring included with the coil boot
  • Design for direct compatibility
  • OE design provides an exact fit for your application
  • Multipack provides one time replace all COP for better deal
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ACDelco – Spark Plug Wire Set (Part No.748RR)

Spark Plug Wire Set

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$145.99
ACDelco GM Original Equipment Spark Plug Wire Sets consist of a set of wires, encased in an insulating material, connectors, and insulating boots, and are GM-recommended replacements for your vehicle’s original components. The wires transfer high voltage pulses between the voltage source, the distributor, and the spark plug. These original equipment wires have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.

Product Features:
  • Durable to help transfer high voltage pulses without damage
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
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Driveworks – Coil on Plug Coil (Part No.26427)

Coil on Plug Coil

from

$56.05
Driveworks® offers a line of aftermarket parts and accessories that are commercially acceptable and competitively priced, which provides professional technicians and DIYers with an affordable alternative for repairs.

Product Features:
  • Direct-fit OE replacement ensures ease of installation
  • Designed to meet OE performance
  • As the leader in commercially acceptable parts, we provide professional technicians with the quality parts they need
  • As the leader in commercially acceptable parts, we provide professional technicians with the quality parts they need
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Carquest Premium – Ignition Coil: Meets or Exceeds Original Equipment Specifications, 1 Piece (Part No.EBC1835)

Ignition Coil: Meets or Exceeds Original Equipment Specifications, 1 Piece

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$45.99
Carquest Premium ignition coils meet or exceed original equipment (OE) specifications and are developed by top OE/OES manufacturers to ensure superior performance. All of our Carquest Premium ignition coils are developed by IATF 16949 certified manufacturers for consistent durability and long-lasting performance. These ignition coils use high-quality components and will utilize optimized designs on applications where the OE ignition coil had frequent failures. We require stringent testing standards to ensure proper fit and performance for each application and stand behind our Carquest Premium ignition coils with an industry-leading warranty. Carquest Premium ignition coils are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:
  • Computer-Aided Design (CAD), laser scanning and 3D printing – utilizing Fused Deposition Modeling (FDM) and Stereolithography (SLA) – in the part design process ensures speed-to-market and a precise fit guaranteed.
  • 100% pure copper precision-wound windings increase coil life and ensure reliability and maximum coil output when needed.
  • Highly conductive aluminum alloy secondary terminal guarantees secondary coil terminals will not oxidize (rust), will provide excellent conductivity, extended coil life and will not cause excessive stress on the primary control circuit.
  • 100% thermo-shock and vibration tested to ensure superior performance in extreme conditions.
  • 100% end-of-line tested to ensure confidence and product reliability, every time.
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NTK – Ignition Knock (Detonation) Sensor (Part No.ID0300)

Ignition Knock (Detonation) Sensor

from

$22.99
Building upon a foundation of premium full-line products established under NGK ignition and NTK oxygen sensor products, NTK’s expansion to technical sensors is part of our ongoing commitment to streamline product types and increase coverage under one premium brand: NTK, The Sensor Specialist. With over 80 years of automotive expertise, NGK’s family of automotive products are driven by extreme dedication to innovation, performance and quality. NTK is the only OE supplier with a full-line of technical sensors in the aftermarket for import and domestic vehicles. Drawing from OE experience, NTK sensors undergo extreme testing conditions that include thermal shock, vibration and OBD verification. NTK sensors are manufactured to ensure a quality that meets or exceeds OE specifications. As new vehicles incorporate connected and automated technologies, trust The Sensor Specialist for full-line market support and OE application technology.

Product Features:
  • Reinforced and extra-strength components are used to reduce chance of part failure and prevent corrosion and moisture penetration. Mounting threads match OE for easy, worry free installation.
  • NTK’s Ignition Knock Sensors are manufactured to operational performance standards to meet or exceed OE fit, form and function to ensure proper ignition timing. This advanced technology is used for durability, drivability and fuel economy.
  • The Ignition Knock (Detonation) Sensor monitors vibrations caused by engine knock, or detonation, to alter the ignition timing and prevent detonation.
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ACDelco – GM Original Equipment Ignition Knock (Detonation) Sensor (Part No.F6020205037ACD)

GM Original Equipment Ignition Knock (Detonation) Sensor

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$39.97
An ACDelco GM Original Equipment Ignition Knock (Detonation) Sensor monitors the engine for pinging or spark knock, and is a GM-recommended replacement for your vehicle’s original component. The sensor creates a voltage signal based on the vibrations caused by erratic air/fuel mixture combustion; the engine control module uses this signal to adjust the ignition timing and air/fuel mixture. This original equipment ignition knock sensor has been manufactured to fit your specific GM vehicle, providing the same performance, durability, and service life you expect from General Motors.

Product Features:
  • Undergo the same stringent testing process as the original part
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
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Carquest Premium – Ignition Knock (Detonation) Sensor (Part No.SBA3734)

Ignition Knock (Detonation) Sensor

from

$39.99
Carquest premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
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Carquest Premium – Ignition Switch (Part No.CSA1039)

Ignition Switch

from

$46.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
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Dorman – Ignition Starter Switch (Part No.924-715)

Ignition Starter Switch

from

$34.49
This replacement ignition switch is a direct replacement for a damaged or worn-out original equipment switch Made of quality materials for durability, this part has been tested to ensure a proper fit.

Product Features:
  • Ideal replacement – this ignition switch matches the fit and function of the original equipment switch to restore proper operation to the ignition circuit
  • Durable construction – this ignition switch is made of quality materials to ensure reliable performance and a long service life
  • Cost-effective solution – offers original equipment performance at competitive price
  • Quality tested – this part has undergone try-on testing to ensure a quality fit
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Carquest – Ignition Switch (Part No.CS643)

Ignition Switch

from

$44.05
High-quality products that meet OE appearance and performance to provide professional technicians and DIYers with a cost-effective solution.

Product Features:
  • Designed to OE standards for ease of installation
  • Copper alloy conductors ensure superior electrical conductivity with low resistive losses
  • Our parts are 100% tested to verify both mechanical and electrical switching performance
  • Robust design and high grade materials meet the stringent demands of today’s service professional
  • BWD is a global manufacturer of original equipment ignition products, complete quality control is maintained through the manufacturing process from componentry to finished product
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ACDelco – Premium Double Platinum Tip Copper Core Spark Plug: Enhances Ignition System Durability (Part No.41-834)

Premium Double Platinum Tip Copper Core Spark Plug: Enhances Ignition System Durability

from

$9.79
ACDelco Gold (Professional) Double Platinum Spark Plug are a high quality alternative to Original Equipment (OE) parts. With a copper core and double platinum pads on the center electrode, these plugs are designed to deliver long-lasting performance. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional.

Product Features:
  • One-piece, fired-in suppressor seal blends three glass types for a gas-tight seal that helps reduce radio frequency and engine interference, regulate spark plug energy, and protect against compression pressures for long life
  • Double platinum point pad on center and ground electrode offer excellent durability and consistent voltage demands to help reduce wear on ignition system
  • Pure copper core results in cooler electrode temperature for maximized durability and fouling resistance
  • Some ACDelco Gold parts may have formerly appeared as ACDelco Professional
  • Premium aftermarket replacement part
  • Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models
  • Conical Seat Type: Designed with a conical seat type for a secure fit and reliable function.
  • Resistor Type: Includes a resistor to help reduce radio frequency interference, ensuring smooth engine performance.
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ACDelco – Double Platinum Spark Plug: Original Equipment Replacement (Part No.41-962)

Double Platinum Spark Plug: Original Equipment Replacement

from

$9.79
ACDelco GM Original Equipment Double Platinum Spark Plugs are designed, engineered, and tested to rigorous standards, and are backed by General Motors. With a copper core and double platinum pads on the center electrode, these plugs are designed to deliver long-lasting performance. ACDelco GM Original Equipment parts are the true OE parts installed during the production or validated by General Motors for GM vehicles. Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional.

Product Features:
  • One-piece, fired-in suppressor seal blends three glass types for a gas-tight seal that helps reduce radio frequency and engine interference, regulate spark plug energy, and protect against compression pressures for long life
  • Double platinum point pad on center and ground electrode offer excellent durability and consistent voltage demands to help reduce wear on ignition system
  • Approved by US Legal 7/31/19
  • Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
  • ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
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E3 – DiamondFIRE Automotive Spark Plug: More Power, Saves Gas (Part No.E3.74)

DiamondFIRE Automotive Spark Plug: More Power, Saves Gas

from

$8.49
The Spark Plugs are the product of years of fundamental research in the combustion field. The unique patented electrode configuration of these new The spark plugs increases the amount of combustion pressure created during each power stroke of an engine, which results in a marked increase in power output, fuel economy, and reduced emissions in all gasoline engines. E3.74 is a 14mm, 1.000 reach plug with a taper seat. It fits a wide variety of late model applications, especially Ford applications. The automotive plugs have three legs securing the Diamond FIRE electrode to the shell. This allows for excellent heat transfer, and helps to create more turbulence in the cylinder. The patented Diamond FIRE side wire is proven to increase power, reduce fuel consumption and improve hydrocarbon emissions in long-term use.

Product Features:
  • E3’s Diamond Fire edge to edge ground electrode provides maximum performance with increased efficiency and a faster more complete burn
  • Smoother Acceleration & Idle – The faster flame initiated by the The spark plug results in a more complete burn of the ingested fuel charge. More pressure is created against the piston more fuel is put to work
  • Energy – Power output improved up to 6% on average in the typical operating ranges. Results will vary.
  • Efficiency – The “diamond shaped” side wire electrode projects the combustion spark in a way that more quickly ignites the air/fuel mixture, thereby creating a significantly faster and larger flame kernel. The result is that more fuel is put to work durin
  • E3’s patented Diamond Fire Technology provides a cleaner burning combustion, which translates into fuel savings and reduced engine carbon deposits
  • The Spark Plugs are pre-gapped at the factory and cannot be adjusted.
  • Enhanced Heat Transfer: Three legs securing the Diamond FIRE electrode to the shell ensure excellent heat transfer and create more turbulence in the cylinder.
  • Wide Compatibility: The E3.74 spark plug is a 14mm, 1.000 reach plug with a taper seat, fitting a wide variety of late model applications, especially Ford vehicles.
  • Eco-Friendly Performance: Proven to reduce fuel consumption and improve hydrocarbon emissions, contributing to a cleaner environment.
  • Long-Term Efficiency: The Diamond FIRE side wire is designed for long-term use, maintaining increased power and reduced fuel consumption over time.
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2004 GMC Envoy XL Ignition and Tune-Up Products

You count on your 2004 GMC Envoy XL to run right. That means taking care of it with regular maintenance, necessary repairs, and the right parts. Advance Auto Parts can help with all of that thanks to our extensive inventory of trusted Ignition and Tune-Up Products. With 94 Ignition and Tune-Up Products ranging in price from $2.99 to $653.99, you’re sure to find everything you need for your 2004 GMC Envoy XL.

Brands matter. If you want to shop a specific Ignition and Tune-Up Products brand, we stock 18 different brands like ACDelco, Autolite, and NGK. 2004 GMC Envoy XL Ignition and Tune-Up Products start as low as $2.99!

One of the best ways to find top quality OEM or aftermarket Ignition and Tune-Up Products is by asking professionals. Short of that, you can shop with confidence thanks to our 4,282 extensive product reviews on 2004 GMC Envoy XL Ignition and Tune-Up Products. Some of the top-rated Ignition and Tune-Up Products products we carry are DiamondFIRE Automotive Spark Plug: More Power, Saves Gas with 4.4 stars and Double Platinum Spark Plug: Platinum Firing, Superior Durability, Longer Life with 4.7 stars.

Did we mention you can order your Ignition and Tune-Up Products from our online catalog and have them shipped right to your garage? Or, if you feel like seeing the parts first-hand, search for your nearest Advance Auto Parts location above and pick up in-store when you’re ready. Browse our full Ignition and Tune-Up Products inventory for your 2004 GMC Envoy XL below to get started!

Top-Rated Ignition and Tune-Up Products Brands For Your 2004 GMC Envoy XL

Trusted Ignition and Tune-Up Products OEM and aftermarket product brands are what Advance Auto Parts specializes in. The brands we work with are sure to keep that 2004 GMC Envoy XL running right for years to come. In our inventory you’ll find brands like ACDelco, Autolite, NGK, and even more.

Popular Carquest Premium Ignition and Tune-Up Products

You’ll find popular Carquest Premium brand products across Ignition Coils and Boots. All are waiting to get your 2004 GMC Envoy XL back on the road. Some of the top-rated Carquest Premium products in these categories are:

Top-Rated Autolite Iridium Ignition and Tune-Up Products


If Autolite Iridium are what you’re looking for, our inventory holds plenty. We stock Autolite Iridium brand Ignition and Tune-Up Products for your 2004 GMC Envoy XL, and some of our most reviewed Autolite Iridium parts include:

FAQs for 2004 GMC Envoy XL Ignition and Tune-Up Products

What are the most purchased Ignition and Tune-Up Products for the 2004 GMC Envoy XL?

Out of 94 Ignition and Tune-Up Products for the 2004 GMC Envoy XL, the most popular in our inventory are:

What are the top-rated 2004 GMC Envoy XL Ignition and Tune-Up Products?

Top-rated Ignition and Tune-Up Products for your 2004 GMC Envoy XL based on customer reviews/ratings are:
DiamondFIRE Automotive Spark Plug: More Power, Saves Gas
from $8.49
(176)
DiamondFIRE Automotive Spark Plug: More Power, Saves Gas
“Great spark plug!!!!”
Double Platinum Spark Plug: Platinum Firing, Superior Durability, Longer Life
from $6.49
(102)
Double Platinum Spark Plug: Platinum Firing, Superior Durability, Longer Life
“Car runs smooth now with better gas mileage”