What is the IAC?
Here's what we did today - sometime ago we took the stock air filter off and put a K&N cononical on to increase air flow. Talked to our local mustang performance shop, and he suggested the K&N might be causing the problem with the stock speed density setup on the 88s. Went back and put the stock air filter & air box back on and see what happened. Ran really great no idle problems.
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