High Idle

1988 PLYMOUTH SUNDANCE
65,000 MILES • 4 CYL • AUTOMATIC
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KIM LESPADE
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  • 1 POST
My throttle will not go at a slower speed it is set really high. how do I lower it?
Oct 17, 2017 at 3:32 PM
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MHPAUTOS
  • CERTIFIED EXPERT
  • 31,937 POSTS
First check for a vacuum leak, this can cause the engine speed to race. clean throttle body and post back how this affects the engine speed for further assistance.
Oct 17, 2017 at 5:18 PM
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STRAILER
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  • 53,854 POSTS
Here is a guide that can help out as well.

https://www.2carpros.com/articles/engine-idles-too-high

Please let us know what happens.

Cheers, Ken
Nov 1, 2017 at 6:39 PM
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