问：大脑在加速越来越硬时摇晃摇晃

Car was running perfectly when I began uphill where I had to accelerate a little harder to maintain speed and all of a sudden this unbelievable shaking rattled the entire car. When leveled out and traveling downhill, the car felt perfect again. The shaking only happens when I'm accelerating quickly from a stop, attempting to merge onto the interstate or drive up an incline. Car still starts and idles perfectly fine as usual and drives fine when just cruising and maintaining speed. I had valve cover gasket replaced by a pro mechanic a few months ago and he said the motor mounts need to be replaced. Could that be the issue? Or what could other causes be?

My car has 205000 miles.
我的汽车有自动变速箱。