Is it a auto or 5 spd? The autos always have a higher idle then 5 spd. What kind of mods do you have. Depending on the specific mod, it will change you idle. Auto's normall run around 800 and the 5 spd's normally run about 650-700. Hopefully that will help you out.
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Cyberstang5.0
1992 Mustang GT 5.0
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