Diagnostic code P1518?

This error code is noticed on 2001 Ford windstar in this particular case.

The code is indicating a problem with the Intake Manifold Runner control system which is an internal secondary butterfly/throttle plate setup. There is an actuator at the front of the intake maniold that will have a vacuum line and electrical connector to them.Inspect the vacum lines and the linkage coming off the black box which is the IMRC for being disconnected.If you are lucky it is disconnected or the vacuum line is broken, if not, further testing of the electronic control system would need to be done.

The above details will help.
Thanks.

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