Hello everyone, I am new to the forum and need some help. I have a 98 GT and have been experiencing some "wierd" problems. I have a complete MAC exhaust, long tube headers, high flow H-pipe and cat-back. Those are the only mods I have and I have not had a chip burned to correct the air/fuel or anything else. Just recently I have been driving around when it seems that the throttle is sticking and the RPMs stay up even when I have my foot off the throttle. I know for sure that it is not the actual throttle itself, is it the IAC valve? Has anyone else run into this before? Please help.....