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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.
There is probably a ridge in the throttle body. Mine did that and I adjusted he set screw on it so it wouldnt slam shut and get stuff. It didnt affect my idle at all.