vibrations on 2002 Mitsubishi Diamante

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Vibration through frame, and moderate clanking noises under the hood suddenly occur while driving the car, which clear up after I stop the car and restart the motor. It works smoothly then upon restarting , but it happens again after a day or two, particularly after a road bump . The car does not overheat, the battery does not go flat, no electrical deficit occurs, the heating works well and the AC also. The car otherwise works fine between episodes. I have 55k miles on it. Timing belt change time? It is very cold here in the NE ;cracked motor mount? Is it an emergency? Dealer or any mechanic can do? Thank you folks
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