well try checking the easier mounts first, front/sides because the rear one can be a pain to get to/replace. Also, try letting the car idle then when it does the vibration get out and see if you feel more vibration on the driver/passenger side or the front of the car, that could be a good indicator as to which mount needs to be replaced. Ive havent been impressed with a lot of the honda mounts so far as im having the same problem on my 99 prelude and I only have 50K miles, I think I found the problem and it seems to be the driver side mount is no good....