The next time you drive, figure out where the "bumps" are coming from, front or rear of the vehicle. Based on your description, I suspect that it is coming from the rear. Once you figure that out, rotate the tires straight from front to back. The idea is to see if the bumps change location, from rear to front, or vice versa. If it does, then you know it has something to do with your tires, if it still stays the same location, then it is in your suspension.
I suspect that (bubbled tire) you have an out of round wheel.
Friday, January 16th, 2009 AT 1:31 AM