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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.
check your timing and get a tune. its not valve float. valve float happens at high rpms when you have weak springs. its when the valve pretty much stays open the whole time because the motor is turning too fast.