Hey, i have a 91 z24 with a 3.1 engine. The other day i put in 2 gallons of gas and went to start up my car and it stalled out. It happened a few other times before i realized i had to hold in the gas pedal to keep it going. I thought it was just bad gas, so i bought some gas treatment to help fix the problem. That and about 5 new gallons of gas to go with it. Thought it helped but it didnt.

I have changed the O2 sensor, but that didnt appear to help. The car only does this at idle, once moving i dont have problems, and it doesnt happen all the time, mostly when the car is warmed up. But it will do it while cold as well. Any help would be great.

 

idle air control
maybe

goodluck

 

What is a good way to check that. I tried to unplug it and then my car really started running rough. Is it possible that its just going bad?