Question about 2000 Mercury Grand Marquis
Sounds like the Idle Air Control valve is stuck. The best course of action is to just replace it since they aren't usually repairable. Also check to make sure that all the wires connected to it are not chewed up and have power with the key in run.
The IAC is the cylindrical looking unit on the side of the throttle body with a 2 wire plug on it.
Posted on Oct 06, 2009
Try throttle postion sensor
Posted on Oct 10, 2009
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Posted on Jan 02, 2017
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