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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.
Idle is way too low. That's part of the problem right there. There is an adjusting screw on the bottom of the throttle body, raise the idle to 8-900 rpms and see where that puts your tps voltage.