This is the Second time it has happened to me. Starts idling rough, bouncing like crazy, then a ticking from the engine, the engine light flashes, traction control locks on and shifts terribly! Then I get it 45 min to the dealer for them to be baffled at how my plugs keep coming off so easily while driving. They said it seems to be a problem on only a few models and they've asked GM to look t it. Maybe get all the covers replaced? Wondering if anyone else is having his problem.