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Rooster, I had a similar set of problems last year from Fall till December. I remember that I had just changed my air filter (second change Stock->Wix-> now K&N). I also removed the intake silencer tube from the wheel well, just because I like intake noise, but now realize I have a free WAI! While I had it open I decided to clean my TB and MAF for first time with appropriate products. After putting it all back together and driving my normal commute, I noticed hesitation and misfire like you described especially at low speeds.
Had the codes read at parts store and bought the Haynes manual, turned out it was MAF sensor wire AND Camshaft Position Sensor (intake side I think).
I think the CPS is a job I can do myself with the repair book, but I had the dealership take care of it as I was also having a transmission trouble and still under 5yr warranty.
CobaltSS forums suggest that the life of these CPSensors is kinda short, the part is about 50-80$ and right on top of the head, real easy to get to if so inclined.
Hope it helps.
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