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When was the last time you removed the throttlebody and gave both top and bottom a good cleaning with a good throttlebody cleaner and a soft brush? Also take the IAC valve out of the t/body and give it a good cleaning also.

---------- Post added at 07:22 PM ---------- Previous post was at 07:21 PM ----------

Even if this is not the problem it should be done if you haven't done it.
 
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