Question about 1981 Ford F 100

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Runs drives fine rought idle at stop idels good in park

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Look for a leak in the hoses between the PCV valve and the motor. If you find any squishy or oily spots on the rubber hoses especially where the 90 degree rubber angles are, this would indicate a hold in the rubber hose and the vacuum leak will cause the vehicle to run poorly at idle.

Posted on Sep 06, 2010

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Idle drops way down in drive gear in park it's fine or running the A/C


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