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When exhilarating to clime a hill at 40to 50 mph the engine starts missing. on 2000 Buick Park Avenue

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The problem occurs on every hill. Took Buick to several mechanics and got several different solutions. From computer problems to transmission/tork converter. But know one was really sure.
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95% of the time it's the plug wires breaking down!! Scanner with misfire data and an ohm meter will find this problem!!!!