You have the throttle plates opened up to transition point so I just pulls just enough fuel to run. The idle circuit opening is a small hole inside the Venturi of the carb below the plates when closed,
This is what is plugged, it can't get fuel to run on with idle adjustment screw backed out to spec. That is why the mixure screw has no effect on adjustment.
This is the hole that you will see the tip of the idle mixture screw at its opening if the screw is fully seated correct? Right below the throttle plates, Or are you referring to another port?
