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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.
the maf could be screwing with your pcm by telling the pcm that you're at like 13000 feet above sea level... doesn't take much and once that heppens holy crap... should be somewhere around 150Hz for around 200 ft above sea level.