could a bad mount cause vibration ?? How do you chg it ?? Thanks

Best way to check for broken or heavily worn mounts is to have someone behind the wheel hold the brake and put the vehicle in drive. You may see excessive movement of the engine, if not, and still suspect bad mounts, have them LIGHTLY bring the engine to around 1500 RPMs, in gear, with parking brake and service brake engaged.

If it is bad, it is not that hard to change. Appearance should give you most of the instructions from logic alone once you get into it.