A plugged catalytic converter has often been reported to be
the cause of these symptoms.
Other, less expensive possibilities: Needs either new air
filter, fuel filter, OEM plugs-wires-distributor cap, and
check the timing. I would not rule out the need for a new
oxygen sensor just yet, either.
How many miles on this car? When was the last time a tuneup
was done? Were OEM parts used?
This is classic clogged fuel filter symptom. Not enough fuel gets to the
engine under the load of climbing the hill. Replace both fuel filters. One
back by the tank, the other in the engine compartment.
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