Well...

When i drive on the highway, i usually accelerate over 140km/h, sometime i do over 120km/h

few days ago, my car started like going crazy, the steering wheel like vibrates or shakes a lot when i speed over 100km/h

Sometimes, Whole thing shakes even seats.

i felt like i am at the middle of earthquake.

anyone knows whats wrong?

 

It sounds like either a tire with low air pressure, a wheel weight came off or you bent a rim.... or you've got some loose lug nuts, those are the most common reasons for it to happen.... inspect each rim and find out where the shop mounted the wheel weights, make sure that every rim has them on, if one is missing them then that's a problem, check your tire pressures and make sure your lug nuts are tight, if all of that checks out and your tires aren't worn unevenly then it could be a snapped band or something.... check those items, if nothing rears it's head take it to a tire shop and ask for their advice, they will probably want to re mount/balance all the rims (it's cheap)

 

It does sound likw your tires are out of balance all four !

WheelBrokerAng