Car was running fine then came up to a light and it didn't idle so well anymore and it also likes to backfire out of the carb when first starting out from a stop. Actually it doesn't really idle at all anymore. I have a Mighty Demon 850 by the way. My buddy has a King Demon and says that the fuel/air screws are always backing out and he has to redo them quite often. Is this my deal or what else could it be?