Check engine light flashing and idling rough

2011 GMC ACADIA
180,000 MILES
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GIZZYCANGY
  • MEMBER
  • 2 POSTS
Car had rough idle and misfiring. Changed plugs and gaskets, oxygen sensor and catalytic converters. Still running bad. Had someone run a scan on it he said ECM needed replaced. Replaced ECM with a plug and play. Car starts up but still has rough idle. Drove it and drives good but check engine light is flashing intermittently. Any advice
Jan 23, 2021 at 10:18 AM
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SEVAG P
  • ✓ASE Certified Mechanic
  • 405 POSTS
  • ASE Certified Mechanic
Hello,

Many things can cause rough running, and misfiring, to narrow down our problem send us the fault code, for proper troubleshooting.

check our guide how to check fault codes.

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

Check our guides for misfire

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

When you read the fault code let us know.

Thank you.
Jan 23, 2021 at 11:35 AM
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