Idle Speed & Mixture (One Carb. Engines): Cadillac

After turning idle mixture screw in (clockwise) for highest engine idle RPM, continue to turn screw in until engine speed falls off 20 RPM (lean idle speed fall off), finally turn screw out 1/4 turn (Standard Engine), 1 1/8 turns (A.I.R. Engine). Adjust other idle mixture screw similarly. Check and reset idle speed as necessary, then repeat idle mixture adjustment. Install air cleaner and recheck idle speed. If idle speed not within specifications, repeat idle speed and mixture adjustment.