Rough idle

2001 PONTIAC GRAND AM
118,400 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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CHRIS SENSING
  • MEMBER
  • 1 POST
So I have replaced the TPS sensor IAC thinking it was fuel injectors, but I read your post about putting washers in. did you put them between the frame and mount?
Jan 13, 2019 at 7:46 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good morning,

Have you replaced the spark plugs? Rough running is most commonly caused by worn ignition parts.

https://www.2carpros.com/articles/how-to-change-spark-plugs

Compression test would be next to be sure there is no internal engine damage.

https://www.2carpros.com/articles/how-to-test-engine-compression

Check for any vacuum leaks, broken or disconnected hoses as well.

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

Is the check engine light on?

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

Roy
Jan 13, 2019 at 7:55 PM
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