So I got an 89 Dodge Colt E 1.5L from my dad a few months ago, and it ran pretty rough when I got it. After replacing the spark plugs, wires, cap, rotor, air filter and fuel filter it still runs badly. It idles rough, and jerks back and forth while cruising. At full throttle it feels okay, and if I let off the gas at highway speeds it's not noticeable either. When idling, it starts to stall and then recovers over and over again. I've pulled the plug wires off one by one while it's running and didn't really notice any change in the crappy idle. I'm wracking my brain here and I just don't know. Anybody want to throw some ideas at me? Thanks...

Scott

Check for vacuum leaks. Inspect the intake ducting for cracks.

Spray fuel injector cleaner through the fuel injection system while it is running. Have to have another person step on the gas while you do this but it should fix the problem....another thing to try is put a can of dry gas in it ...they are very picky with their gas

if you get time do a compression test

check for a weak valve or cylinder down on pressure