Checking for vac leaks:
Squirt oil around any suspect areas like vac fittings, power brake hookups, and especially the base of the carb gasket/spacers, that is a classic vac leak area.
My next step is always to put the carb back on but with a different spacer or no spacer if you can, and some good gaskets that seal all around. Look for passages where the manifold and carb and gasket dont quite match up and air could sneak in.
But the dirt in the boosters is my most common trouble.
dirt in carb:
Sometimes in the 2100 the idle holes in the main body will plug or rust. If you pull the mixture screws out with the carb off, run a wire thru that hole right into the throttle bore. That's the easy hole to clean but there are a couple other tiny transition holes in the throttle bore right above them, very fine wire will clean them.
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HAVE A NICE DAY!!!!