I have a problem with my car when it idles. My car vibrates when it idles. Most of the vibration seems to be coming from the steering wheel, when I take my hand off the steering wheel the vibration gets worse and seems like there is something loose. The car runs and drives perfect eccept for this. The car only vibrates when idling in drive. Although sometimes when the car is in park the steering wheel will shake. The steering wheel does not shake while driving. A few things I have tried so far are getting a tune up, cleaning the air intake, changing air filter, getting new tires getting a wheel allignment, and I changed the tie rod ends. What could the problem be.