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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.
I am not 100% on any mods. Bought the car secon hand and that owner bought second hand and didn't know. The car will not hold an idle less that 900. The codes only show thermactors bad.