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why is my car idling at 2,300 rpm at startup and when i park?

  

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1999 Chevy Prizm base model 100k miles

It Idles at 2,300 rpm whenever I park or start the car but has (no check engine lights)

When i drive its stays at a stable rpm


2 Answers
2

Check operation of your IAC valve.


2

Scotty says it is carbon

https://youtu.be/595ZwZE_DS8?t=230


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