So Bob, one question:
Does this code come on following a misfire that you can feel in the thr***le. Or more simply put, can you 'feel' the vehicle hesitate or stall during a misfire, then the code comes on??
Only reason for asking is because my '07 SS/SC throws a misfire code from time to time as well. Nothing is wrong with my car at all, no hesitation from upon acceleration but if I do drive it for a long period and stop at a drive through of any sort and kick the revs up before moving forward, my Check Engine Light comes on and that same code reads on my scanner. I just clear it and it doesn't come back on until I am stuck in the same situation.
May just be how the ECU is programmed but I didn't know that the Turbo version of the Cobalts experienced the same problem.