How do you adjust idle after you turn the screws all the way in on a rochester 4 bbl?

To adjust the idle on a Rochester 4-barrel carburetor after turning the screws all the way in, first back the idle mixture screws out about 1.5 to 2 turns to provide a starting point. Next, start the engine and let it warm up, then adjust each screw gradually while monitoring engine RPM and smoothness until you achieve the desired idle speed and quality. Finally, check the idle speed adjustment using the throttle stop screw, ensuring it's set to the manufacturer’s specifications for optimal performance.