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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 had a similiar problem with one on my stangs after I installed a MSD box. I replaced many different parts. The coil, the TFI module, cap and all. It ended up being the distributor itself.