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If the transmission has a vacuum modulator you may have connected the wrong vacuum line from the carb. Otherwise, check the downshift linkage connected to the accellerator. After you've done those things, if it's still having problems, ask again. or vaccume leak

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โˆ™ 2009-02-12 21:06:02
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Q: Could a faulty carb cause a newly rebuilt tranny to downshift from third to second then shift into third again randomly at even speeds of about 50 mph?
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