So, the CC works fine all the time, except when you get to a steep hill?
Is this an automatic trans? Is it downshifting like it should? If not, could
be a transmission problem.
But it does sound like the gas pedal isn't being pulled all the way to the
floor (if you can "pump" the pedal, it isn't at the floor). Which points to
problems with either a linkage (cable IS the linkage, in this case) that
needs lube (grease and/or oil all points from the pedal to the throttle body)
or a vacuum leak.
You can test the vacuum "pot" that actuates the CC by pulling off the hose
and attaching a vacuum pump (MityVac is a popular brand available on-line and
at some auto parts stores) to it. Pump it up (or down, in this case
and
see if it will hold vacuum.
The vacuum system consists of more than just the CC pot, however. Could be
leaky hose or a canister that won't hold vacuum due to a split, crack, hole,
etc.
Diagnosing needs to be done.
Good luck,
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.
DaveC
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