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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 got a high output 5.0 in my 86 and when it warms up it tends to idle irratically like it almost wants to stall but it doesn't do it constantly. It eventually even's itself out and then will do it again eventually. Bad sensor?? TPS?? If anybody has had the same problem and found out what it was please let me know.
Check for vacuum leaks. Get a can of staring fluid and carefully spary it around the upper to lower intake and all vacuum hoses, it might give you a clue if there is a vacuum leak.