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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.
When you say shakes do you mean when you are seating in it you can feel it shake? Steering wheel or seat? Weak motor mounts can cause some of the problem.