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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 similar problem once on a different car that ended up being the roll pin that holds the distributor gear had snapped. The rotor would rotate from the gears sticktion to the shaft then let loose and it would die. It would run sometimes others not........took me a while to figure out.