Rough idle

1991 CHEVROLET LUMINA
160,000 MILES • 3.1L • V6 • AUTOMATIC
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LBOWENS1210
  • MEMBER
  • 1 POST
The car will start but idles rough, then shuts off when put in gear and accelerated. Had fuel flow but changed fuel pump anyway and checked and cleaned fuel filter. Someone said coil packs. I do not have any idea. Can someone please help?
Feb 26, 2018 at 9:42 AM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
Sounds as if you have a misfire or a vacuum leak. do you know how best to check for a vacuum leak? can you do a compression test? when were the spark plugs last changed?
Feb 26, 2018 at 6:48 PM
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RENEE L
  • MEMBER
  • 1,260 POSTS
Hello LBOWENS1210,

If you decide to conduct the compression test yourself here is a link to an article from our site with written step by step instructions, pictures and video to guide you:
https://www.2carpros.com/articles/how-to-test-engine-compression

Also, here is a link to an article from this site on how to check for a vacuum leak:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

If you have any questions or need further advice please reply to this post and one of experts will be happy to help you.

Thank you for visiting 2CarPros and have great rest of your day!

Renee
Admin
Feb 27, 2018 at 7:13 AM
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