My 97 Ram 1500 318 4x4 won't shift gears when going up a hill with cruise control on. I have to step on the pedal to get it to shift and maintain speed. Any Ideas???
I think it's a vacuum leak - the cruise servo is vacuum operated, and if there's a leak, or the non-return valve in the vacuum circuit is defective, there isn't enough vacuum to open the throttle past a certain amount.
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