Question about 1988 Plymouth Sundance

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The engine has recently started to idle very fast when the car is in park, and tapping the gas pedal doesn't help.

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Examine all the vacuum hoses as one most likely has cracked, usually at a bend or
has come completely off. This will cause very high idle.Hope this helps.

Posted on Apr 01, 2011

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Is the check engine light on? Check the IAC valve this adjust your engine RPMs when a load is put on your engine,such as a/c-power steering,brakes,ect.check by unpluging the electical conection,start the motor for 30sec,shut off,disconect battery for 30sec,hook battery back up and electical plug to IAC,start engine,if this does not correct the problem replace the IAC valve,

Posted on Apr 01, 2011

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I'm not sure if you've found the answer to your question yet...but i'm having a simlar problem with my car it could possibly be the Throttle Position Sensor. Simple explanation from what I understand it tells the engine how much your pushing on the gas pedal and if this peice is off it can send misreading to the engine causing high idle. I replaced it in my car and it works fine now. Park was $30~ at Auto Zone.

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