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When using cruise control car has a hesitation when going up hill on 2001 Chevrolet Impala

Changed O2 sensors and plugs and wires and still doing it

Asked by for the 2001 Chevrolet Impala
UNDER NORAMAL DRIVING NO ISSSUES
Normally no issues under normal conditions. Occasionally there is the same hesitation or "bucking" so to speak. Only between 55 and 65 going up a hill.