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Impala rough idle

Tiny
THISMESSAGE
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 3.4L
  • V6
  • FWD
  • AUTOMATIC
  • 127,000 MILES
Idles roughly but as soon as I turn on my a/c it runs a lot better. I just replaced the oxygen sensor on the car and that helped out a little. When it begins to idle roughly I tap the gas pedal and it runs better for a few seconds and when I'm driving it usually doesn't misfire until I've been driving for a while.
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Friday, May 1st, 2015 AT 6:22 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
More than likely this is a vacuum leak, so we need to start with this guide to see if we have a vacuum leak or not:

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

If there are no vacuum leaks, then we need to check the other basics.

That means we need to check for codes and find out if we have codes:

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

Lastly, we need to check the fuel pressure and find out if we have low pressure. I doubt this is the issue, but we need to rule it out.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Please run through all this info and let us know what you find.
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Thursday, March 10th, 2022 AT 7:06 PM

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