Have an old Craftsman 3/20 ES Start it up with choke in open position. When snowblower is warm I close the choke.
Now, when I begin to close (pushdown) the choke, about halfway through, the engine stalls. Keeps happening.

Any ideas?

Thank you.

Clean the carb, is this the old tank mounted type of carb? Could also be the diaphram in the carb.