What causes vibration in a car?

Sometimes broken engine mounts, rough engine performance problems, worn out harmonic balancers, and transmission problems. People expect to get a specific answer for all of their questions, especially in automobiles, but in reality, an automobile is a complex piece of machinery that needs very precise inputs and calibrations to run properly. Thus, there are many different arrays of problems that can cause similar symptoms. Other causes at speed are bent wheel, tire out of balance. warped rotor, etc.