Out of the blue all of the systems in my 2004 Chevy Tahoe went crazy the locks opened and closed the A/C would stop blowing cold as if the compressor was disengaged the stability system was disabled the traction control would turn off the engine light would come on and the reduced power message would flash across the display, and then the truck would die. This would only happen if I hit a bump in the road. If I turn off the ignition let the truck sit for a min and then start it up, it would run fine until I hit another bump and then everything would go nuts again.