One simple fix is to try to clear the idle circuit at idle mixture screw. From the present setting lightly screw it in while counting exact turns. Then screw it all the way out, clean it with a shop towel and carb cleaner. Then use the red tube on carb cleaner to squirt cleaner in the carb where the mixture screw was removed. Carefully replace screw, lightly seat it and back it off the number of turns you counted.
