Well guys I just installed an C&L plenum and 75mm Accufab throttle body on Saturday and you already know what I am going to say. Talk about insane idle hang and crazy revving. So, before I make the same basic thread let me start with the basics. So the car either does one of 2 things every time you come to a stop or shift it. Whatever RPM you are at when you push the clutch in, is the RPM the car will stay at until you are at a complete stop. For example if I am in second gear and rev it out to 3000rpm to shift, if I push the clutch in and just sit there without shifting, it will just sit at 3000rpm or even flare up a few hundred rpm until the car comes to a stop for at least 5 seconds.. If it does decide to come down because I decelerate is really low, it will just sit at a minimum of 1500rpm until you come to a stop. The tps sensor is set at 0.99v with the throttle shut. I do not believe there is a vacuum leak because I sprayed all over it with throttle cleaner with no change and the fact that it comes back down to 750rpm when sitting at a light for a few seconds. Where to next? All my sensors and IAC were fine before this. Is it my SCT tune? Its just things like this that make you want to get rid of the car. BTW this is my 97 GT 2v. Thanks for any advice you can give.