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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.
Had the same problem, check the fuel injectors and spark plugs. your fuel injector could be stuck open, allowing the fuel pump to constantly be pumping fuel to the open injector which could cause your engine to flood, making it hard for the car to start