hi guys, car starts fine, but when idling the rev counter cant stable itself it revs up and down slightly by itself, as soon as i accelerate in neutral it returns back to its normal position where it should be but even still its not completely stable. some people have told me to get it re-tuned? others have told me to clean the IAC valve, im not sure where or how to clean it could anyone help, thanks alot. also if you know of any others probs it could be hit me up!