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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.
Connected the battery cable back up still have a check engine light.. Now that I have installed the stock mass air flow I no longer have a rough idle.. The car us running perfect, just still have the light on??
If I had a nickel for every Foxbody mustang out there that ran perfect with a check engine light on I would be richer than Trump. Ignore it, if its running perfect its probly just an emissions fault. Most likely smog related. Unless your in a state or county that does emissions inspections I wouldn't even worry about it.
As long as the car is not overheating, doesn't ping on acceleration and doesn't choke you to death on exhaust fumes I say let it eat.