98 Sonata w/ vibtarions

How does one tell if the engine and transmission mounts go bad? Can feel the vibrations from the engine running + in gear. [Timing is okay; replaced the belt w/ proper timing last fall in Nov 05]
Vehicle did not vibrate this bad before. Any help would be great!
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Do you have a four cylinder? If so, one of your balance shafts may not be timed properly. Lining up the mark on the balance shaft/oil pump sprocket driven by the main belt is not sufficient to insure proper timing.
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