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Rod, Fast Idle Cam- Carter BBD ... Idle Mixture Screw- Carter AFB, RBS 10-32 thread x 1.452" L, OE Idle Mixture Screw- Carter BBS, BBD, ... Carburetor Idle Mixture Adjusting Tool Pin Vise Small Parts Plastic Storage Bin - 18 Compartments ; AFB Step Up Pistons & Springs. Jul 23, 2022 · Problem: stalling when it comes off of fast idle. The carburetor is of the type that has a hot idle screw between the two mixer screws instead of on the side. I think this is supposed to hold the throttle open a little when it heats up ( I might be mistaken). The screw is currently at two turns from seated position, mixer screws are at one turn.. Getting your carbureted muscle car to cold-start easily is a matter of know-how. The AFB (Aluminum Four Barrel) carburetor was produced by Carter for original equipment cars from 1957-1971. The AFB was then available as a high performance 9000 series carburetor up until the late 1990's. Weber is currently making the AFB now known as the Edelbrock. The accelerator pump controls response when pressing down on the gas pedal.. The first thing to do is not set up the idle speed, but to set the idle mixture screw to lean best idle setting. First, turn in the mixture screw until the engine dies or runs worse, then back out the screw (recommend turning ¼ to ½ turn at a time). The engine should pick up speed and begin to smooth out. Back out ½ turn more, or until the. Adjusting The Fast Idle Speed Screw b) With the engine off, turn the throttle to its side wide open position and hold it there. This will expose the fast idle set screw behind the choke housing. c) Using a ¼ inch open-ended wrench, turn the screw clockwise to increase the RPM or counter clockwise to decrease to RPM. What should my SBC 350 idle at?.