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My 92 PA had a similar problem. At low engine speeds it would shake pretty bad. It turned out to be the harmonic balancer. You can easily check this by looking at the front end of the engine. It is the pulley that drives all the belts. If the rubber has deteriorated, it could be the cause of your problem.

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15y ago
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Q: What causes a 1990 Buick Century to shake and stall out when the car is slowed right down or stopped?
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