I just changed the Distributor Cap and Rotor, and 4 Spark Plugs, and it still is running real Real Rough, Sputtering and Not Running good at All, Fuel Pump and Fuel Filter are Newer Models too, so what else could cause this Problem?? I have not replace the Fuel Pressure Regulator, or any of the Fuel Injectors (yet) because I wish to not just Replace too many Parts that are Not the Issue. Also my "Check Engine Light" it does Come On, but I can't find anyone who can Analyze that, (so far)?

Cars & Trucks - Mercury - Topaz - 1994 Mercury Topaz