So, my Volvo, when approaching 80 mph, will start to wobble and shake. I am not talking about a little engine shake, but suspension rocking. This happens because of the 70-30 weight balance and worn front tires as well as your car sitting for two and a half years. The suspension sags and when approaching higher speeds it starts to lift because of the engine but the tires drag it down and it becomes a cycle of wobbling.