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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 just replace my engine and ran ok but my headers are turning red hot I have no clue why is something wrong with the engine please aprecciate any info thanks.....
Do you still have the converters on your car? you need to check and see if they've been clogged. check fuel pressure and timing make sure everything is where it should
If you still have your emissions equipment your air pump might not be diverting TAB/TAD problem. Did you disconnect the vacuum lines when installing the headers? Is it running ok? not missing or blowing black smoke is it? plug wires on correct? Or a clogged convertor problem.