If the problem goes away as the engine warms up, then I agree that it is probably your IAC (Idle Air Control) valve (aka: IAB).
It is about the size of two 35mm film containers, and is mounted to your TB. Remove the 2 wire harness connector, and the 2 bolts (10mm, I believe), and clean it with Brakleen (green can) and some pipe cleaners. After you re-install it, reset your ECM so that it will relearn it's idle settings with a clean IAC.
Take care,
~Chris
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