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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.
Dude I would break down and take it into a tuner, maybe its a ECU Problem.... You never know seems liek whatever it could be you have already fixed it, have you double checked your valve train Geometry