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I don't think so. The automatic transmission is controlled by engine speed, vehicle speed and throttle position. A large vacuum leak could effect throttle position, but it would cause other problems more noticable than the effect on transmission shifting. a vacuum leak mpuld not cause trasmission to slip but a band inside transmission would cause the problem

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โˆ™ 2006-04-13 20:58:44
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Q: Would vacuum leak cause automatic transmission to slip on 98 Pontiac Grandam?
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