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Q:

HARMONIC BALANCER on 1999 Oldsmobile Aurora

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THE HARMONIC BALANCER HAS A WOBBLE WHJEN IT IS RUNNING BUT IT SEEMS TO BE TIGHT. WHY DOES IT LOOK TO BE OUT OF BALANCE?
(1) Answer
The balancer is comprised of the metal pulley and a heavy rubber dampener that smooths out inherent engine vibration at the crankshaft.

It will be bolted down securely, but if the rubber starts to separate from the pulley - then it will wobble and vibrate badly. A diagnosis is very much in order, as soon possible. This pulley can break off.