Check your air cleaner. Take the bottom bowl off to see if there is dirt/ice, etc in it. Another quick test is to take the air cleaner hose off and see if it has any effect on this behavior.
also, check the fuel screen on the sediment bowl and if there is one on the carb inlet. make sure you have good fuel flow the entire way along the fuel delivery path.
icing on the carb exterior is normal, although it would be interesting to use a blow dryer while you are having the symptoms to heat up the throat area of the carb while running.
Last question, do you let it come up to temp before you start working it? at first, this sounds similar to a condenser problem, however, that would not explain why it will run with the choke on......so check out the fuel delivery first.
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