Try changing spark plugs
"Walt Blackman" > wrote in message
t...
> HAVE OLDS REGENCY, 1980 VINTAGE. PASSED SMOG TEST IN LOS ANGELES. CARB
> REBUILT.
> YET, WHEN DRIVING IN LOWER RPM, OFTEN WHILE GOING UP SLIGHT INCLINE, CAR
> HESITATES, WHEN TAKE FOOT OFF OF GAS PEDAL AND THEN ADD PRESSURE, SLIGHT
> BUCKING AND HESTITATION STOPS. USE 91 OCTANE. WOULD APPRECIATE ANY TESTS
> THAT CAN DETERMINE PROBLEM.
>
> WALT
>
>