Yes, make sure the throttle shaft doesn’t bind and the butterfly closes completely on its own, without “help” by looking at the butterfly with the carb off while operating the throttle shaft. On the other hand, perhaps the throttle shaft is worn allowing air to sneak in around it…Trying another carb will answer help decide if this is a carb issue….Those little stamped throttle cams get bent very easily, so perhaps someone “bent it back” and this is holding the butterfly open at idle….
PS: There is supposed to be a little spring on the cam follower to help make sure the carb closes fully at idle…
