If your Jeep is not running as smooth as it once did, it may be time for a tune-up! Omix has all the necessary high-quality parts to restore the performance to your engine- parts built to meet or exceed factory standards. This ignition tune-up kit fits 99-00 Cherokee XJ 4.0 liter models and includes new oil filter, air filter, ignition wire set, distributor cap, rotor and spark plug set.