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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.
Get your ignition control modual checked. It is located on your dizzy and they are prone to being effected by heat. If that checks out good, next thing I would look into would be the coil.
turn key and here the pump...or look at the gauge i have on the fuel pressure reg... spark... take the coil wire off or any of the plug wire off and ground it...