Hello,

Sometimes, when my car reach 50-60 mph on a highway, the car would vibrate and it would also lost power.

Also, I can hear loud clicking sound whenever I turn the steering wheels, it's coming from the front.

What could be the problem?

Thanks

(BTW, after I drive my car for a while and turn off the engine, I can hear loud metal clicking sound under the car, is this normal?)

the vibration could be from an imbalaced tire. maybe the tire has a screw in it. as for the clicking..not sure about that one.

cv joints perhaps