Holley Carburetor - Cold Start Fast Idle Adjustment

Does your car carbureted car have trouble idling on cold mornings? Hidden on the passenger side of most four barrel carburetors is a second idle adjustment called the fast idle. This is located behind the electric choke on Holley carburetors and is only accessible if you manually open the throttle. The fast idle screw adjusts your idle RPM when the car is cold and the choke is activated which can prevent the car from stalling. This is different from the curb idle screw which adjusts the idle when the car when the choke is off. Ideally, the fast idle should be set to about 1200 RPM to allow the car to warm up and go into gear without stalling on a cold morning. The carburetor in this video is a Holley 80457 and is 600 CFM. This is a 1986 Chevy C10 with air ride suspension.