Saturday, I had 4 Cooper CS4s (T rated) installed on my 98 Lumina LTZ. I also had an alignment done. Now, whenever I travel at or above about 50 mph, the car shakes and the steering wheel has a slight pulsation, often continuously. The car doesn't pull in either direction, however. This never happened with my old Goodyear Tripletreads. What could be the problem? Edit: I did get them balanced at the same time. Probably should've mentioned that, haha.