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Runing rough at idle

Tiny
MICHAEL1984
  • MEMBER
  • 2000 PONTIAC GRAND AM
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 109,000 MILES
My car is running rough the check engine light was on but with no working on the car the check engine light went off but it running rough and running rich what would cause this problem. I gave it a oil change I changed the up stream oxygen sensor but did not replace the down stream. Nothing seem out of place.
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Sunday, April 3rd, 2011 AT 2:16 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
https://www.2carpros.com/articles/service-engine-soon-or-check-engine-light-on-or-flashing

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.
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Sunday, April 3rd, 2011 AT 7:16 AM

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