When i first start my cutlass supreme it idles really high the tach is at 3 i think,but when i drive it for a few miles and shut it off and start it again then its fine for the rest of the day. my other car idles high for a few min. then kicks itself down to normal, but my cutlass doesnt return to normal. i let it run for like 20 min and it didnt kick down. i tried to tap the gas to see if it would kick down but it does not. I just bought a new idle air control module and it still does it, i cleaned the throtle body and no diffrence. Does anybody have any ideas in what the problem might be?