Check for any vacuum leak, such as a boot issue as mentioned. If you find nothing, pull the carbs and clean them well. You might have dislodged some trash in a bowl and stopped up your pilot/idle circuit.
"I'd like to meet the joker who had the nerve to call this a road!"
-- Walter Sigmann "Do not follow where the path may lead. Go, instead, where there is no path and leave a trail."
-- Ralph Waldo Emerson "Who am I? Why am I here?"
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