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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 would try that, and also but not at the same time, pull the vacuum line from the pressure regulator and take it around the block, that will let you know if its a lean condition.