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 just got my 1990 gt running good now my only problem is that it idles high when the clutch pedal is released. (1500-2000rpms) when the clutch is engaged whether the trans is in gear or in neutral it idles perfect right around 800-1000 rpms with minimal surging. i rebuilt the motor last summer with a set of gt40 heads and intake, b303 cam and mac longtube headers. ive worked out all the bugs (i think) except for this one. and i have never heard of this problem before. any ideas?
Last edited by offthewall158; 08-17-2012 at 02:40 PM.
Hard to say. Good place to start would be vacuum leaks, but I'm thinking this might be related to the neutral switch, I just need to find out what year the ECM programming included an idle bump for shifts.
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