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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.
I've usedSTP Fuel Injector Cleaner, it worked great, but it can't be the best as you can buy at every stinkin' gas station. I was pinging before I used it, and wasn't after I used it.