All Models
If Cruise Control holes speed three or more MPH above that selected, turn centering spring adjusting screws (on regulator) towards "S" 1/32 of a turn (Oldsmobile) or 1/8 of a turn (Pontiac) or less. If cruise control holds speed three or more MPH below that selected, turn centering spring adjusting screw toward "F" 1/32 of a Turn (Oldsmobile) or 1/8 turn (Pontiac) or less.
CAUTION:
DO NOT move adjustment screw marked "R". This is a vacuum restriction adjustment screw and is preset at factory.