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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.
probably not but take a couple out and inspect them. Too many variable effect spark plug life to say "yes" or "no"
Are they copper core or platinum? Straight copper core can be good up to 30K miles depending on driving habits, gas used, and overall maintenance of the car.
I'm another one here for autolite 25's, never had a problem with them. Check your plugs now, see what kind of shape they're in and than take it from there.