hey my car has a rough idle and i can see the window where the milage is dimming a little with every uneven rev if that makes sense. I am trying to figure out what is going on.. i cleaned the throttle body and that didn't seem to help... any other ideas?? i really want to get it figured out, especially b4 i put in nitrous and other stuff. Maybe its the sparkplugs or coil packs??? give me ur ideas thanx.

 

check the battery and alternator. autozone will test them for free.

 

ground the big 3....

 

how low does the rpm go? check spark plugs & coil packs

also, go through the stickies there's a couple hundred different things that can cause a rough idle

 

well if your alternaor is bad, that will cause your car to not have enough voltage to supply the ignition coils to saturate them fully. that would cause your car to run rough.