Is it my motor mount?

While driving on the highway, my engine stopped responding to my pedal, and was continuously increasing in speed. I would hold my brakes down, it would slow my car, but the engine was still in ping gear. I opened the hood after having it towed home, and turned it on, and when it turns on, the engine wobbles towards the car. Could this be a broken motor mount? I have a 2003 Oldsmobile Alero.