I had the same problem. Culprit was a loose fitting IAC connector. Problem is that part is now impossible to buy new. So i used zipties to clamp it on TIGHT. Now problem solved. So check your IAC connector. There should be absolutely no play in it. 1 way to tell is have the engine at idle and move the connector around. If u have a change in engine note u have a problem there. Hope it helps.
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