I have a 2007 Ford Focus which has an intermitant engine vibration problem. The car drives fine on short trips(20 miles) but on long highway trip the car engine( I think its the engine definitely not steering) will start vibrating while under light acceleration. If I take my foot off the gas the problem goes away.
On a long trip this occurs 2-4 times. I have had motor mounts replaced. Thanks for your help!