ok, it doing everytime you run the car, or does it go away when you shut it off? If its doing this all the time, it can be a number of things,
1. Vacumm leak
2. IAC valve ( on throttle body ) stuck open
3. Mass Air sensor faulty
4. TPS sensor bad or unadjusted.
Do you have any warning lights on ?
if yes, well check for codes.
sometimes, if you not in the habit of getting on your car often, you get carbon and grime biuld ups in the throttle body and something could have gotten stuck in the IAC valve causeing it to stay open.. if thats the case, take it off and clean it with TB cleaner. Also for a vaccum leak a hose could have popped off, or cracked open from flex.
The ECU could also do that, and it isn' t common but it could have gone bad or just temp flaked out. if after you check all of this and it still does it, the disconnect the battery for 20 min + and the re connect and start the motor.. if it clears up then it was a ECU issue. If it doesn't well, it could still be a ecu issue and you could try a different one to see if its the problem. let me know what you find.
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