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On my wife's Aveo LT Sedan, the engine studdors and the gas pedal becomes non-responsive. You could put it to the floor and the RPM's, if in Park, go up to 2500 or so. If in gear the car Slowly gets up to around 10 MPH. If I shut the car off and restart it goes back to normal. I have scanned it before and the only code I get was something about Bank 1 O2 sensor. Can't remember Code number. Can O2 cause this problem or do I have two seperate issues?