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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.
cars do that sometimes when they have blow by issues... run a compression test and hit up a wideband O2.... you might be too rich and your washing your cylinder walls
Sounds like a ring issue to me... When the piston rings get worn down more exhaust gets past them (blow by), and collects in the fuel. I might be wrong, but that's my vote. Injectors might indirectly cause this problem, I'd imagine that if the fuel pressure/rate is increased, that more exhaust would be available to get past the rings and into your oil. Good luck