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My ODBII monitor show code P1518 and the book indicates that the code means Idle Air Control CKT intermittent actually means. Do not understand the CKT part of the message.

Vehicle: 1999 Ford F150 V6

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P1518 Intake manifold runner control (IMRC) stuck open,

You are equipt with a IAC what CKT mean is circuit. just a connection P1518 is IMRC stuck open this is something the  Windstar uses, there are some F 150 that uses IMRC if this code comes up it mainly due to the clip poping out and its a matter of clipping it back together.IAC(idle air control) controls engine speed by varying the amount of air that by passes the throttle plate.CKT intermittent means 2 thing its not responding when the ECM gives power, or its just not functioning, Think of this a flashlight with good batterys that wont turn on is it the buld or the switch.

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