my fucking 95 gst does the same thing and i need to find out what the fuck it is. mine used to only do it sometimes once it got warmed up but today it has been constant. 3000 rpm at idle and it drops down to 2600 with the a/c on. ive played with the idle set screw and it did nothing. im thinking the tps or the iac. i need help bad. cel is not on.