I have a 2006 Impala. When driving on the highway up to 60 - 70 mph my passenger seat trembles a bit, i would get off and feel what i may assume is my muffler moving a bit so i hit the emergency brakes and release and the trembling stops, i went to a muffler shop and they said all is good that it might be the motor supports so i switch those but the problem persists.... I know I might need an alignment since my tires are getting eaten up, and my wheel carriages need maintenance as well as new brakes. Could that be the problem or any other ideas. SORRY TO DUMB AND BROKE TO TRUST A SLEAZY MECHANIC
I think you are getting it right, tires and an alignment.
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