I have an Impala '11 and I'm experiencing service stabilitrak, and also while I'm driving, it will all of a,sudden decelerate on its own, which is very scary when your on the highway. It then shows on the notification screen reduced engine power, disabled throttle, and the engine completely turns off, the power steering goes out. I had to pull off the side of the highway onetime on my way to work and let it sit for a few min b4 it would let me start it again. Needless to say I want this fixed. I haven't rec a letter about it yet. As of today my gears shift moves however will not put into gear on the dash so I am unable to start my car.