I'm not sure whether it is a sensor or a fuel problem. It has to be one or the other, but the check engine light is not lit up. The rpm shifts up and down about every 5 minutes or so while I'm driving. It's definitely not anything internal inside the motor, its almost like a sputter. Perhaps this is a common problem with this year impala at this mileage?? Please help! Thank you.
Sep 16, 2009 at 6:32 PM
