I have had an issue with my 06 Cobalt SS for the past month or two. If i accelerate (its an automatic) to quickly (bit of a lead foot) out of an intersection or merging onto a highway my traction control light comes on and makes my car shift really hard into second and then not so bad to third. WTF is going on?! I took it to the dealership and paid $250 to replace a sensor then a couple days later it did it again. I took it back and they didn't know why. Of course. Anyone had this issue??