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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.
As for my base idle problem just had a question, why is it that when i unplugged my maf sensor i was able to get it to idle at 800 rpm, or strange coincedance?
Hey Dude! I had the same problem as you have described witht the idle not coming down. Only once the mass air was unplugged(like me). Try resetting your tps sensor. I had mine at .44(too low). Reset it to .98 and then high idle problems. I reset the computer with no luck. Lowered the tps back down to .60 and no she idles and drives fine. I have read some say that this setting is ok and others say stilck with .98. This is working for me, so it will stay for now. Good luck