ACCEL TST21 Truck Super Tune-Up Kit Everything you need to super tune your vehicle in one package Includes a distributor cap and rotor a wire set and a complete set of spark plugs Designed specifically for 1987 to 1990 4.0L inline 6 cylinder Jeep engines with electronic fuel injection Spark plug wires are pre cut to exactly the right length Easily installed and backed by ACCEL's famous Limited 1 Year Warranty