1991 Ford LTD Ignition and Tune-Up Products

Essential 1991 Ford LTD Ignition and Tune-Up Products

MSD Ignition – Distributor Gear; Ford 5.0L; with EFI; Steel (Part No.85834)

Distributor Gear; Ford 5.0L; with EFI; Steel

from

$145.99
A distributor’s performance is only as good as its drive gear. MSD ignition has put a great deal of effort into researching and testing a variety of metallurgical compositions, heat treating and coatings to provide you with a durable, accurate and strong distributor gear. The result is a special iron alloy gear that is treated to a low-friction coating process. To you this means long life, an easy break-in period and reliable performance. Features micro polished surface for smooth contact. Proprietary formulated ductile iron. Melonite QPQ coated reduces friction and initial wear. Interstitial carbide concentration improves wear resistance and running properties.

Product Features:
  • Increased outer hardened layer thickness (RC 55-60)
  • Micro Polished Surface For Smooth Contact
  • Proprietary formulated ductile iron.
  • Melonite QPQ coated reduces friction and initial wear
  • Interstitial carbide improves wear resistance/running properties
See More

Carquest Premium – Distributor Reluctor (Part No.REA1001)

Distributor Reluctor

from

$7.99
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.
See More

Carquest Premium – Spark Plug Wire Set: 10 Wires, Increased performance, Designed for direct fit (Part No.35-8166)

Spark Plug Wire Set: 10 Wires, Increased performance, Designed for direct fit

from

$39.99
Product Features:
  • SAEJ2031 Class E cable resist heat (428 Deg. F), cold (-104 Deg. F), electrical interference, abrasion and oil.
  • Stainless steel magnetic winding delivers maximum voltage to the spark plug for more powerful, and longer spark resulting in optimum engine performance while reducing the chance for misfire, and eliminating radio static.
  • 100% Pure silicone external insulation resists oil penetration, for lifetime protection against wire set failure.
  • EPDM inner insulation stops power-robbing voltage leaks.
  • With Magnetic-impregnated Kevlar internal conductors – durable and break resistant
  • Engineered to meet OEM tolerances using variable pitch wire winding, creating better resistance to electric magnetic interference (E.M.I resistance).
  • Excellent interference suppression and consistent performance
  • Easy lock terminals for more convenient installation.
  • Thick silicon outer jacket for excellent heat resistance. Insulating EPDM based compound inner jacket helps minimize voltage drop and enhance durability.
  • Broad coverage available for most vehicles on the road today
  • Include grease pack to ensure easy installation and removal
See More

Carquest – Distributor Ignition Pickup (Part No.ME48)

Distributor Ignition Pickup

from

$43.99
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
  • High temperature enameled wires were specified for better insulation and performance
  • With industry leading expertise in electronic ignition, when original equipment fails our products are designed to fix the inherent failure issues
  • BWD is a global manufacturer of original equipment ignition products, complete quality control is maintained through the manufacturing process from componentry to finished product
See More

Carquest – Ignition Coil Connector (Part No.PT753)

Ignition Coil Connector

from

$17.05
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
See More

Motorcraft – Original Equipment (O.E.) Switch Assembly – Ignition (Part No.SW-5011)

Original Equipment (O.E.) Switch Assembly - Ignition

from

$81.99
The only parts recommended by Ford Motor Company for Ford, Lincoln and Mercury vehicles.

Product Features:
  • Direct-fit, OE replacement parts – identical to factory installed parts. Robust design helps provide long operating life and excellent performance.
  • All OE switch functions are maintained. Factory connectors help ensure a solid, positive connection. Provided factory mounting points ensure easy installation – new gaskets and attaching hardware is included, where applicable.
See More

Carquest Premium – Ignition Module (Part No.CBG1008)

Ignition Module

from

$58.99
CARQUEST Ignition Modules are built by an ignition systems manufacturer with expertise in the entire vehicle spark system.

Product Features:
  • CARQUEST Ignition Modules creates and refines the timing of the engine using various sensors and readings throughout the spark system in order to create an efficiently running engine.
  • CARQUEST Ignition Modules use current and voltage limiting circuitry in order to prevent the ignition coil from over voltage/current. Over voltages can allow for coils to create excessive heat which can damage to the ignition module resulting in check eng
  • CARQUEST Ignition Modules are 100% individually tested for all product functionalities including over voltage, timing and dwell.
See More

ACDelco – Copper Core Spark Plug (Part No.R85TS)

Copper Core Spark Plug

from

$3.49
ACDelco Gold (Professional) Conventional Spark Plugs are a high quality alternative to Original Equipment (OE) parts. These Conventional Spark Plugs are designed for reliability and efficient performance, and are the high quality replacements for many vehicles on the road today. Their high-quality copper cores and outstanding suppression characteristics deliver reliable performance. They are also available for Marine applications. 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:
  • Black Onyx coating helps reduce corrosion
  • Copper core provides great heat transfer and helps maximize plug durability
  • Ribbed suppressor seal extends resistance and helps prevent spark ‘flash over’ and misfires
  • Nickel-chrome alloy sheathing helps prevent corrosion on center electrode
  • Available for use in Marine applications
  • 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
See More

Accel – Super Stock Elect Coil Chrome (Part No.8145C)

Super Stock Elect Coil Chrome

from

$72.99
Excellent high performance coil for vehicles that have been converted from points to a breakerless electronic distributor or electronic ignition system, where a canister type oil filled can coil is preferred. Designed with optimized low resistance, high turns ratio windings to work specifically with ACCEL 41, 51, 52, 61 & 71000 Series breakerless electronic replacement distributors. Engineered for higher energy output resulting in quicker starting, improved throttle response and more high RPM power. Special crimped and soldered internal connections ensure positive contacts. High performance tan Alkyd tower provides “”flashover”” protection to primary terminals. Available in “”ACCEL Yellow”” or Chrome Plated can.

Product Features:
  • Engineered for higher energy output
  • Improved throttle responce
  • More high RPM power
  • Chrome Plated
See More

Dorman – Help – Spark Plug Non-Foulers – 18mm Tapered Seat (Part No.42002)

Spark Plug Non-Foulers - 18mm Tapered Seat

from

$9.99
This spark plug non fouler is designed for easy installation on specified vehicles to protect spark plugs from fouling and damage. It is engineered for durability and reliable performance.

Product Features:
  • Direct replacement – this spark plug non fouler is designed for easy installation to protect spark plugs from fouling and damage on specified vehicles
  • Ideal solution – this non-fouler preserves spark plug life and is a reliable replacement for an original non-fouler that has failed due to corrosion
  • Durable construction – made from quality components to ensure reliable performance and a long service life
  • Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
See More

Carquest Premium – Distributor Check Valve (Part No.ECA1176)

Distributor Check Valve

from

$11.99
CARQUEST premium engine management products provide the right automatic transmission speed sensor for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions. Designed to meet OE quali

Product Features:
  • Lifecycle tested to meet or exceed OE specifications
  • Direct OE replacement
  • High strength thermoplastic is resistant to shock, temperature and chemicals. Also protects internal components from moisture and contaminants.
  • Global coverage for import and/or domestic applications.
See More

MSD Ignition – Distributor Gear; Ford 351W; Bronze (Part No.8585)

Distributor Gear; Ford 351W; Bronze

from

$83.39
MSD Bronze Distributor gears are machined from quality AMPCO 45 aluminum bronze containing 5 percent nickel. This special combination creates high-strength gear teeth that are less prone to wear even with high volume oil pumps. Features increased outer hardened layer thickness (RC 55-60). Micro polished surface for smooth contact. Proprietary formulated ductile iron. Melonite QPQ coated reduces friction and initial wear. Interstitial carbide concentration improves wear resistance and running properties.

Product Features:
  • Increased outer hardened layer thickness (RC 55-60)
  • Interstitial carbide improves wear resistance/running properties
  • Melonite QPQ coated reduces friction and initial wear
  • Proprietary formulated ductile iron.
  • Micro Polished Surface For Smooth Contact
See More

Motorcraft – Spark Plug Wire: 2 Year Warranty Unlimited Miles, Set of 8 Wires (Part No.WR-4017C)

Spark Plug Wire: 2 Year Warranty Unlimited Miles, Set of 8 Wires

from

$111.99
Motorcraft Plug Wires are Manufactured of premium-quality materials to strict Ford Engineering standards. High-Dielectric Insulation helps maintain and control voltage delivery while reducing Radio Frequency Interference. EPDM/Silicone wire jacket, spark plug & coil/ distributor insulators help protect against oil and high temperatures. Optimized wire lengths help minimize part numbers while still providing proper fit. Designed and Tested to Stringent Ford Standards.

Product Features:
  • Backed by Motorcraft’s Service Parts Warranty
  • Designed for long life – key life durability testing (equivalent to 10 years/150,000 miles) is conducted in addition to on-vehicle durability testing.
  • Optimized wire lengths help minimize part numbers while still providing proper fit.
  • Wires are optimum lengths for easy installation.
  • EPDM/Silicone wire jacket, spark plug AND coil / distributor insulators help protect against oil and high temperatures.
  • Motorcraft ignition components help prevent false check engine lights.
See More

MSD Ignition – Crank Trigger Kit; Small Block Ford (Part No.8640)

Crank Trigger Kit; Small Block Ford

from

$593.99
For a long time, racers have known that one of the best things to do to an engine to improve its performance is to stabilize the ignition timing. The MSD flying magnet crank trigger system does exactly that by using magnets embedded in an aluminum wheel. The MSD flying magnet crank trigger uses four magnets secured in the aluminum trigger wheel that pass by a stationary non-magnetic pick-up to trigger the ignition. This flying magnet design produces accurate trigger signals and the non-magnetic pick-up cannot be false triggered. Each flying magnet crank trigger includes a two-piece mounting bracket for the non-magnetic pick-up that in most cases will work on either the passenger side or driver’s side of the engine (the SB Chrysler and SB Ford brackets mount on only one side). The adjustable bracket provides a wide range of timing adjustment and spacers are included. These systems will trigger MSD 6, 7, 8 and 10 series ignitions and all MSD timing accessories.

Product Features:
  • Absolutely The Most Accurate Way To Trigger The Ignition
  • The non-magnetic pickup cannot be false triggered.
  • Powerful magnets are embedded in a billet aluminum trigger wheel.
  • Incl. brackets/mounting hardware to fit a variety of engines
See More

MSD Ignition – Distributor Gear; Ford 302; non-EFI; Steel (Part No.85833)

Distributor Gear; Ford 302; non-EFI; Steel

from

$131.99
A distributor’s performance is only as good as its drive gear. MSD ignition has put a great deal of effort into researching and testing a variety of metallurgical compositions, heat treating and coatings to provide you with a durable, accurate and strong distributor gear. The result is a special iron alloy gear that is treated to a low-friction coating process. To you this means long life, an easy break-in period and reliable performance. Features micro polished surface for smooth contact. Proprietary formulated ductile iron. Melonite QPQ coated reduces friction and initial wear. Interstitial carbide concentration improves wear resistance and running properties.

Product Features:
  • Increased outer hardened layer thickness (RC 55-60)
  • Micro Polished Surface For Smooth Contact
  • Proprietary formulated ductile iron.
  • Melonite QPQ coated reduces friction and initial wear
  • Interstitial carbide improves wear resistance/running properties
See More

PerTronix – D9011 Flame-Thrower HEI Distributor Counter Clockwise Vacuum Lockout Kit (Part No.D9011)

D9011 Flame-Thrower HEI Distributor Counter Clockwise Vacuum Lockout Kit

from

$10.99
Vacuum Advance & LockoutThese vacuum canisters help optimize ignition advance for maximum part throttle performance and cruise speed efficiency. Our vacuum lockout plates allow for precise pickup coil position and accurate rotor phasing.

Product Features:
  • PerTronix D9011 Flame-Thrower HEI Distributor Counter Clockwise Vacuum Lockout Kit
  • These vacuum canisters help optimize ignition advance for maximum part throttle performance and cruise speed efficiency.
See More

Carquest Premium – Ignition Control Module Connector (Part No.PTA1196)

Ignition Control Module Connector

from

$21.99
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
See More

Carquest Premium – Ignition Switch Connector (Part No.PTA1318)

Ignition Switch 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
See More

MSD Ignition – Wire Set; Super Conductor; 8-cyl. Multi-Angle Plug; Socket/HEI (Part No.31199)

Wire Set; Super Conductor; 8-cyl. Multi-Angle Plug; Socket/HEI

from

$129.99
Set includes terminals for engines with early type (socket) and late type (HEI spark plug top) distributor caps. 90 degree boots and terminals factory installed on one end.

Product Features:
  • Extra Long 8.5mm Wires So You Can Cut To Your Designed Length
  • Incl. both socket-style and spark plug-style boots and terminals
  • Includes Mini-Stripper-Crimper For Factory Style Crimps
  • Size Includes: [2]48/50/56 in./[3] 32 in. Wires/Boots/Terminals
  • Durable outer sleeve is a proprietary compound for resistance to high heat or abrasion
  • Stainless steel terminals feature dual crimp tabs to grip wire conductor and outer jacket separately
See More

PerTronix – Flame-Thrower Electronic Distributor Billet (Part No.D130700)

Flame-Thrower Electronic Distributor Billet

from

$353.99
Plug n’ Play billet distributors are designed for maximum ignition performance at a price you can afford. Our distributors ship with Ignitor II technology modules. Replace your outdated points, electronic distributor or bulky HEIs with this performance

Product Features:
  • PerTronix D130700 Flame-Thrower Electronic Distributor Billet Ford Small Block Plug and Play with Ignitor II Technology Vacuum Advance Black Cap
  • Precision CNC machined 6061-T6 billet aluminum housings are lightweight yet offer maximum strength.
See More

MSD Ignition – Wire Set; Super Conductor; Ford 289-302 with HEI Cap (Part No.35399)

Wire Set; Super Conductor; Ford 289-302 with HEI Cap

from

$154.99
The MSD 8.5mm super conductor wire is the performance wire. Engineered from the inside out, the 8.5 offers everything you have ever wanted in a wire; incredibly low resistance without electronic interference. In a single 12 inch length of super conductor wire there is only 40 – 50 ohms of resistance. That is the lowest resistance of any helically wound wire. To accomplish this, we use a copper alloy conductor due to it’s great voltage carrying capabilities. The low resistance results in less loss in spark energy so more reaches the spark plug. The conductor is wound extremely tight around a special center core. So tight in fact, that there is over 40 feet of conductor wrapped into a single foot of plug wire. This winding procedure, combined with a ferro-magnetic impregnated center core, produces an extremely effective electro magnetic interference (EMI) or choke. This choke, or suppression capability, keeps the EMI inside the wire where it cannot interfere with other electronics on your vehicle. The outer sleeve that surrounds the conductor assembly is just as impressive. A proprietary blend of silicone and synthetic material produce a sleeve that is highly resistant to high heat as well as abrasion and tears. Available in universal kits and bulk lengths.

Product Features:
  • Bolt-on Performance
  • Custom Fit For Make And Model Listed
  • Wires Are Pre-Cut To Exact Specifications
See More

Carquest Premium – Spark Plug Wire Set: 9 Wires, Increased performance, Designed for direct fit (Part No.35-8193)

Spark Plug Wire Set: 9 Wires, Increased performance, Designed for direct fit

from

$35.99
Product Features:
  • SAEJ2031 Class E cable resist heat (428 Deg. F), cold (-104 Deg. F), electrical interference, abrasion and oil.
  • Stainless steel magnetic winding delivers maximum voltage to the spark plug for more powerful, and longer spark resulting in optimum engine performance while reducing the chance for misfire, and eliminating radio static.
  • 100% Pure silicone external insulation resists oil penetration, for lifetime protection against wire set failure.
  • EPDM inner insulation stops power-robbing voltage leaks.
  • With Magnetic-impregnated Kevlar internal conductors – durable and break resistant
  • Engineered to meet OEM tolerances using variable pitch wire winding, creating better resistance to electric magnetic interference (E.M.I resistance).
  • Excellent interference suppression and consistent performance
  • Easy lock terminals for more convenient installation.
  • Thick silicon outer jacket for excellent heat resistance. Insulating EPDM based compound inner jacket helps minimize voltage drop and enhance durability.
  • Broad coverage available for most vehicles on the road today
  • Include grease pack to ensure easy installation and removal
See More

Driveworks – Distributor Cap (Part No.24079)

Distributor Cap

from

$17.05
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
See More

Carquest Premium – Distributor Cap and Rotor Kit (Part No.CAC1847)

Distributor Cap and Rotor Kit

from

$11.79
Distributor Cap and Rotor Kit

MSD Ignition – Wire Set; Super Conductor; 8-cyl. 90f Plug/90f Plug (Part No.31229)

Wire Set; Super Conductor; 8-cyl. 90f Plug/90f Plug

from

$129.99
Routing spark plug wires is an art form. It takes patience and time to route your wires away from the headers, through separators and to the distributor cap. Some wire sets fit perfect, but a lot of people want to build their own so they can route them exactly how they see fit. Our Universal spark plug wire sets come with the spark plug terminal and boot installed with the other end open. Distributor cap boots and terminals are included so you can cut the wire to the desired length, then install the terminal with the supplied Mini-Stripper-Crimper. It’s a little more work, but in the end it will be worth it.

Product Features:
  • Extra Long 8.5mm Wires So You Can Cut To Your Designed Length
  • Distributor Cap – Boots and Terminals Included
  • Incl. Mini-Stripper-Crimper
See More

Accel – 8Mm Super Stock Spiral Uni Rd (Part No.5040R)

8Mm Super Stock Spiral Uni Rd

from

$101.99
The traditional ACCEL combination of yellow wire and red spark plug boots has been added to these SuperStock Spiral Core 5000 Series wire sets, which feature color-matched wire and spark plug boots in blue, black, and red. With only 500 ohms/ft. of resistance, more ignition energy can reach the spark plug, producing a longer-lasting, hotter spark flame kernel. The results is higher performance through improved efficiency, quicker throttle response, and reduced emissions. This 8mm wire’s double silicone construction is rated to 550 degrees F. The high-gloss wire jacket resists moisture, chemicals, and heat extremes for longer life and great looks. The fiberglass braid adds greater pull strength and terminal retention, while the stainless steel spark plug terminals provide excellent long life, electrical conductivity, and corrosion resistance. Both universal and custom-fit applications are available for early and late model cars and trucks.

Product Features:
  • 500 Ohms/ft Of Resistance
  • 550 F Rated Silicone Jacket
  • Stainless Steel Plug Terminals
  • High RFI Suppression For Street And Strip Use
  • Universal And Import Coverage
  • High-strength Fiberglass Braid Construction
  • Pre And Post HEI Vehicles
  • 8mm High Gloss Silicone Jacket
See More

Carquest Premium – Distributor Rotor (Part No.DAC1022)

Distributor Rotor

from

$7.49
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.
See More

Carquest Premium – Distributor Rotor (Part No.DAA1002)

Distributor Rotor

from

$4.29
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.
See More

1991 Ford LTD Ignition and Tune-Up Products

You count on your 1991 Ford LTD 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 171 Ignition and Tune-Up Products ranging in price from $2.49 to $593.99, you’re sure to find everything you need for your 1991 Ford LTD.

Brands matter. If you want to shop a specific Ignition and Tune-Up Products brand, we stock 20 different brands like ACDelco, Autolite, and Motorcraft. 1991 Ford LTD Ignition and Tune-Up Products start as low as $2.49!

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 1,663 extensive product reviews on 1991 Ford LTD 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 4.1 stars and PT16TT Platinum TT Spark Plug with 4.6 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 1991 Ford LTD below to get started!

Top-Rated Ignition and Tune-Up Products Brands For Your 1991 Ford LTD

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 1991 Ford LTD running right for years to come. In our inventory you’ll find brands like ACDelco, Autolite, Motorcraft, and even more.

Popular Champion Ignition and Tune-Up Products

You’ll find popular Champion brand products across Spark Plugs. All are waiting to get your 1991 Ford LTD back on the road. Some of the top-rated Champion products in these categories are:

Top-Rated NGK Ignition and Tune-Up Products


If NGK are what you’re looking for, our inventory holds plenty. We stock NGK brand Ignition and Tune-Up Products for your 1991 Ford LTD, and some of our most reviewed NGK parts include:

FAQs for 1991 Ford LTD Ignition and Tune-Up Products

What are the most purchased Ignition and Tune-Up Products for the 1991 Ford LTD?

Out of 171 Ignition and Tune-Up Products for the 1991 Ford LTD, the most popular in our inventory are:
Spark Plug (ASF42CF4)
from $6.79
(28)
Spark Plug (ASF42CF4)
Spark Plugs

What are the top-rated 1991 Ford LTD Ignition and Tune-Up Products?

Top-rated Ignition and Tune-Up Products for your 1991 Ford LTD based on customer reviews/ratings are:
DiamondFIRE Automotive Spark Plug: More Power, Saves Gas
from $7.49
(184)
DiamondFIRE Automotive Spark Plug: More Power, Saves Gas
“I used these type before.”
PT16TT Platinum TT Spark Plug
from $5.99
(90)
PT16TT Platinum TT Spark Plug
“On line”
Wire Set; Black Super Conductor; Ford 302; 351W; HEI
from $147.99
(53)
Wire Set; Black Super Conductor; Ford 302; 351W; HEI
“Easy to change gasket ring and filter. Makes changing oil a whole lot easier”