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Vacumn modulator could be At Fault. In older cars both the transmission and the cruise control rely on engine vacumn to know what the engine is doing, if the vacumn strength is not properly relayed to these components then odd behiavior will result because the tranny and cruise control don't know what the engine is doing.

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Q: Whats the problem when 1987 corvette gears arent shifting properly way too many RPM's Cruise control wont accelerate Is this a related problem?
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