Originally Posted by 92b18hatch
iac gives the engine the right ammount of air for when the throtle is closed and the car is still in gear coasting, so it doesnt choke out, or sputter.
update.i changed my spark plugs last sunday and i noticed that one of the spark plugs ring (i hope you understand what i mean) is black while the other three were brown,so took it to the guy that did the swap for me and i showed him the plug,and he said that i'm running rich in one cylinder he says that i have a bad injector in one of them but don't know which one coz i forgot to mark them when i pulled it out, is there anymore possibilities other than injector to make one cylinder run rich? or it's only the injector responsible for that? please reply thanks.