Answer to: Why does my car Vibrate when I accelerate?No. It's your motor mount. Focus motor mounts going bad is common. I thought my daughter's exhaust was just loud in her car....I then realized it was the motor mount, replaced it, and it took care of the problem. If you are a do-it-yourselfer, this was not a big deal when I did her 2006 Focus ZX3. The main thing to be aware of is type of motor mount you buy at the parts store. I bought the "insert" and reused the metal housing...which worked fine but is a bit of work to put the insert in and bend the metal tab. The insert costs about $50. If you buy the entire motor mount, which would be easier to replace (pull the old one out, put the new one in) the entire unit costs about $110 I think. YouTube has videos.