If when you rev the engine vibrates, then i would think your fan and clutch are bad. Why dont you take a look to see if the fan spins freely and even.
In most cases the motor mounts are the ones that cause this to begin with. Look at the fan shroud and plastic fan clearance.
If this vibration only happens when driving, then you better take a look at your driveshaft (U-joints).
david
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