[rosenkranswa]

Yep, clean the carb. Had exactly the same thing happen on three of my cars. Bad gas slowly gumming up the works.

Pull the carb and split in half. Clean the bowl and squirt carb cleaner through all of the jets until they flow freely, don't need to remove the jets to do that except maybe the Grosse jet. Reassemble and remount. Should be good as new.

I've started running the carb dry before shutting down if its going to set more than overnight.