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could possibly be a vacuum leak that only comes out when the engine warms up, maybe the throttle isnt returning all the way to idle, could be IAC motor.. last time I diagnosed the IAC, I did this:
start the truck and let it come down to the "slow" idle after 45 seconds or whatever.. then unplug the harness from the IAC motor and drive around and see if the fast idle comes back.
mike
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