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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.
you're able to pull codes from your cars computer via the koeo/koer self testing. it will tell you if there is something not functioning properly or not working. should help you/us figure out what your issue is.