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mercury Marquis code P1506

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please define what may be the problem?

Vehicle: 2001 Mercury Marquis

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P1506 Idle air control (IAC)  overspeed

What they should call P1506 is vacuum leaks. you can probable hear the vacuum leak,this can be from cracked or punture intake air tube, to the IAC seal.to the PCV valve and or its hose.

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