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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.
My '90 5.0 conv starts fine, runs great for the first few miles. Let it sit while in the store 1/2 hr and then it runs rough, bucks and barely makes it back home. The only code stored is a 32. I cleaned the EGR valve and it seems to work fine. What to try next?