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Running loud and rough and idles high

Tiny
DAWN GIBSON
  • MEMBER
  • 1995 CHEVROLET MONTE CARLO
  • 3.4L
  • V6
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Four months ago I bought it, it ran fine with no issues. Then drove to work and on my way home started to run rough and got louder and idles high. Acts like if wants to stall or loses power. Changed the spark plugs and ran seafoam through gas and used seafoam spray in the throttle body. No change. Any ideas on how to fix?
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Tuesday, January 26th, 2021 AT 12:01 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The running louder could be from an exhaust leak in the system itself.

https://www.2carpros.com/articles/how-exhaust-systems-work

The high idle could be from a vacuum leak causing the engine to run higher.

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

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Is the check engine light on?

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

Roy
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Tuesday, January 26th, 2021 AT 3:52 AM

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