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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.
if a filter doesnt help... id run a cylinder balance test on it... that will narrow your problem down quite a bit... i need to do one on mine, as it backfires when its in closed loop... 1st thought for me is o2s(hey could be ur problem too!) but it could be an injector... a balance test will tell u.