Vehicle vibrates when accelerating on passenger side.

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This happens often, but not all the time. The motor mount was fixed, cv-axle was replaced and have a new set of tires. Still the vibration is there but not as much prior to the above repairs. Had it checked for leaking, but my "shade tree mechanic" could not locate the leak. Took on out-of-town trip. It handled great except for occassional vibration. It almost feels like something is slipping and vibrating at the same time.