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Engine idling rough

Tiny
THOMASMWARDIII
  • MEMBER
  • 2001 MITSUBISHI ECLIPSE
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 134,876 MILES
When the car is in park or in gear while running it idles very rough. For example, sitting at a red light or while in park with the engine running. It seems to idle below 1,000 RPMs. But it will slightly move up and down? Do you know what the problem could be or what part I might need to replace to fix? The car is an RS model.
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Thursday, March 4th, 2010 AT 7:06 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

It sounds like you have a vacuum leak, or the throttle bore is dirty and needs service. I wanted to ask do you have a check engine light on. If so, let's run the codes these three guides can help us see what's going on so we can get the problem fixed:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/throttle-actuator-service

Please run down these guides and report back.
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Monday, May 30th, 2022 AT 4:39 PM

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