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Intermittent Engine Vibration

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My 97 ls400 has recently started vibration which comes and goes, vibrates for 2-3 seconds then stops 2-3 seconds then starts again. Does not do it at idle, but asyou start to accelerate it begins. Seems to be worst about 1900-2100 rpms. Does it in park as well as moving. Asked a couple of shade tree guys about harmonic balancer but they don't think so. One said needed a tune up, I replaced plugs, distibutor caps and rotors with no change. Did not replace ignition wires. Anyone have a suggestion?

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