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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.
Aluminum is one of the greatest condutors of electricity. Ofcourse. Your poor idle could be caused by vacuum leaks after the H/C/I. Just do a once-over on everything as well.