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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 swear by seafoam. It's cheap and very effective. I used to do small engine repair for years and we used a ton of it. I've seen it turn bad gas good in alot of engines. I've also used it in the oil and it cleared up noisy lifter problems within minutes.