I'm posting this for my brother (3855). It seems that when he is cruising along in his Bullitt at speed (2K rpms) and puts in the clutch the rpms don't come back down...ever. In order to get them back down he has to put the car back into gear and brake until the rpms are back to 1K. He says it does it pretty much every time. Inside the engine compartment he says that he can see the throttle return, but even then the rpms don't drop. So, what's wrong with it? IAC is the only thing that I can think of, but does it flow enough air to maintain 2-3K rpms?