Quote Originally Posted by Pittman06 View Post
warped rotors if its when you brake, otherwise you have either a bad tire (out of round from belts more then likely) or a slightly bent wheel on the front. Take em to a tire shop and have the fronts spun on the balancer and tell em to look for a bad tire or bent wheel. A random shake in the wheel is always a out of round tire/wheel assembly

edit- if you find a bad wheel or tire throw it on the right rear and you won't notice it at all really until you get it fixed
x2...whenever i get an alignment done, i always have them balance the wheels too. its only a few bucks more and avoids problems like these.