This happened after the car sat for about 2 months without being started up...at all. Anyway, the car runs perfect, but whenever I sit at idle it likes to dip down to 800 or sometimes 700 then come back up to 900-950 (what it normally sits at). I've changed the plugs and wires, tried some injector cleaner, and am changing the oil tomorrow. What else could be causing this?

The car is stock other than the cat-back exhaust and intake, but it was idling rough before either were installed.

vacuum leak

Your throttle body or idle motor may have carbon build up, just take off the throttle body and check it out. If its really black, clean it off with some carb cleaner and a rag, and do the same to the idle motor.

Alright I'll try it.

same thing happened to me...but then i changed the IAC and got a really high idle lol, and while i was doin that i found that i had a leak where the TB meets the intake mani..i got gasket material for it b/c its literally only half there..and im hopefully fixin everything tomorrow

Mods: Doesnt really matter b/c unless i go turbo, i can RUN faster than my car :P