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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
well when it is hot like its supposed to be unpluggin the iac wont affect the idle much. u sure you dont have a vac leak somewhere? spray a bunch of carb cleaner all around your intake manifold upper and lower and if the rpm go up then you have a leak.