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I would say a(n) engine mount is broke somewhere or your tranny is slippin. Check the engine idle speed and the motor mounts. I don't know quite what you mean when you say "jump", but both of those problems can cause a vehicle to react negatively when you put the car in gear.

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โˆ™ 2006-06-08 02:24:59
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Q: Why would a 1990 grand prix LE jump when reverse is engaged?
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