Thread: 88 mustang
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Old 08-14-2017, 11:42 PM
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I shouldn't even be talking, because of little experience with big cams, but this is what popped into my mind. Could your friend have the gauge hooked up to the distributer vacuum port and the distributer hooked up to the gauge port? There also could be some sand or flakes of dirt in the idle circuit. Food for thought. Good luck diagnosing.
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