Long shots
Have you checked the carb diaphragm for leaks? Even a pin-hole can cause similar issues to those described. Alternatively, it is possible that the diaphragm has shifted slightly as there's a boss on it that should sit in an indentation on the carb body and it takes very little displacement for the carb to get "huffy" about running.
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loki_the_glt - Skipper of the Exxon Valdez, driver of Sweden's finest sporting saloon - and pining for another Slant-4.
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