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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.
check your catalytic comverters. If they are plugged, there will be too much back pressure causing the engine to die when you give it gas. Same thing happened to my dad with his 88gt, but he was on the highway.