A more common result of a faulty IAB valve is a poor idle when cold, however, if the valve were to stick open, it would result in a high idle when warm. That being said, and the fact that it never hurts to do it anyway, you now have valid reasons to clean yours. Get some wire pipe cleaners and a can of CRC Brakleen (green can), and go to town. Make sure you reset the ECM after you're finished.
Take care,
~Chris
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