My 1999 Ford Escort has had a few engine problems. However, the most prominient thing that I have noticed is that it vibrates really hard. Recently I had the back motor mount and the alternator replaced after it stranded me on the highway. I knew that the motor mounts could have been the problem but now with the back one fixed it is just the same as always. Is there anyway to fix this? Or, is there any way to take better care of my car to keep it running until college is over?