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Try changing the 'idle air controller' value/motor. A $60.00 part

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You can remove this part and clean it using any fuel injection or intake cleaner. Carbon deposits sometime build up in the plastic gear and spring and does not allow it to work correctly.cleaning it can sometimes solve your problems.

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โˆ™ 2010-07-11 12:43:43
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Q: If a 1993 Mercury Cougar 3.8 idle is racing at 3000 rpm and you changed pts and mass air flow what is wrong?
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