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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.
moisture in the distributor and/or bad plug wires, try some dielectric grease on the plug wires in the ends at the plugs. this helps seal out moisture that could be killing the spark when it's wet out.