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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.
My 91 GT, when I start it up, will kill unless a hit the throttle for a second. It also idles poorly. It will stay running but the idle fluctuates between about 500 and 1200 rpms. I cleaned out the sensor that goes in the throttle body. Don't know what else to check.
when it is idleing spray carb spray all around upper and lower intake and see if the idle changes if so air leak if not bad map or tps or maby mass air