Check Engine Light, car runs rough and lean?

  • 2004 PONTIAC GTO
  • 5.7L
  • V8
  • 2WD
  • 155,000 MILES
So, I just bought my car last year. I’m new to the car scene and am learning at my own pace. When I bought the car, it already needed oxygen sensors. Didn’t have spare money or time to replace them immediately and parked the car for the winter. When starting the car again this year it was dropping gas mileage like crazy. So, I replaced the oxygen sensors to see if that wouldn’t improve the air/fuel ratio. But then the car after taking a test drive would on acceleration stutter or jerk around 1500 rpm and will continue to with increased RPMs. I then come to a stop sign and the car is idling really rough, to the point where it’s jerking the car back and forth like crazy. And on occasion the car will stall when idling in gear or in park. I replaced the spark plugs just to be on the safe side, but I still seem to be having these issues. I just bought a code scanner and it threw a EGR code, a Catalytic Converter code, and an air intake code. I cleaned my air intake and made sure there wasn’t any leaks in the tubing. But I also read these cars don’t have a EGR system so I’m not sure what the problem is and was just curious as to your thoughts.
Do you
have the same problem?
Tuesday, May 30th, 2023 AT 3:42 PM

1 Reply

Hello, a generic OBD2 scan tool like that might not interpret the codes correctly. I don't see an EGR system either in the wiring diagrams. Also, after replacing all the oxygen sensors, the ECM will take some time to relearn its fuel strategy. What are all the code numbers that you have?
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Wednesday, May 31st, 2023 AT 10:44 AM

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