Hello, I am experiencing an intermittent vibration during acceleration. It usually starts after shifting into 2nd. My shift knob shakes like crazy. There is no vibration in the steering wheel and it only happens every few days, when I let off the gas pedal it goes away and starts back up when applying my foot to the pedal again. I recently changed the U-joints but that did not help the problem. Any suggestions on what it can be? Thank you in advance.