[jonalley]

What does your linkage look like and have you made any changes to it? It may be binding on that one bank.The idle mixture screws should show a change in rpm as you screw them in or out. You can disconnect the linkage and the motor will run on the throttle stop screw setting for each bank- the screw on the side of the carb (IDAs)not the idle mixture screw. If that one side then responds to idle screw changes you know something is wrong with the linkage.