Help please! My son bought a used 2010 Chevy Cobalt in November. Within a few days, he started having problems with it. All of the gages on the dashboard started going crazy, the gas guage would go up and down, it said low fuel. The check engine light would come on and he couldn't tell how fast he was going. The tacometer display would say things like power steering, low fuel, etc. The car would also, jerk a little when this happened. We can't figure out what is causing this. Has anyone else had similar problems?