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Well a couple of months back my car was idling around 2000 and wouldnt come down. I replaced the IAC, and it went back to normal. All the sudden it is doing it again. Only difference being that now when the car is started it revs to 2000 and then slowly creeps down after about 30 seconds. But never drops to as low as it should. If I unplug it while it is at the higher rpm it goes back to normal immediately. This tells me that the valve is working properly I would think. There are no codes or engine light. Any ideas guys??? 94 3.8
 
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