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Posted

My truck has the 5.3 AFM engine. After I start it " cold or warm " the idle spikes  to a little over 2000 RPMs and falls quickly to normal idle. This started last summer even in hot weather. If I drive 20 or more miles and shut it off, then immediately restart it, the RPMs quickly rise then fall to normal range within a few seconds. The computer shows no codes and the truck drives and behaves normally after that.

Posted

Cable throttle or drive by wire? If it is cable try cleaning the throttle body including the IAC

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