I replaced the iacv and the situation improved but has not been completely eliminated. I have not had time to drive or trouble shoot the past months. When I do get back to it, I plan to clean the iacv again and increase idle. My ign timing was accurate the last time it was checked. Idle is slightly rough but could be due to step 2 cams. I chased down many leaks before but it did not have much effect on the situation. good luck!
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