Pontiac Bonneville vibration at high speed or accelerating.

woodchuck59

I'm experiencing a vibration while at high speed or accelerating, but not all the time. The steering seems tight and doesn't pull. I checked under the car and found grease spray coming from the right cv boot which led me to look at the front engine mount. I didn't notice too much rise from the engine when testing for a bad motor mount. I could use more direction or tests to help find the problem.