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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.
1995 gt dont want to idle runs better when it is hot a high rpm you can not hear the fuel pump boog all the time but when it does it runs good at high rpms changed the fuel pump and the filter seemed to help a little but still running bad thanks alot.
pull your maf out of the housing clean it with brake clean, blow try it then try, sounds like MAF problem to me, also check vaccume leaks and condition of plugs wires cap and rotor.