Problem has gotten worse. the service suspension system light comes on. Smell burning rubber sometimes when I come to a stop.
my bonneville GXP shakes when driving, and gets worse the faster I go. on 2004 Pontiac Bonneville
maybe your tires are out of round or badly unbalanced
If not the tires, could be a bad ball joint or tie rod end. Need insp. to find out which is the problem.