i have a 96 blaster all stock it will start right up in a kick or 2 but have to keeping tapping the gas to stay running. ive tried turning the idle screw all the way to the left and right and tried turning the air/fuel screw all the way in and all the way out. it runs the same. i can go through the gears and it runs strong if im just putting around it is real jerky. ive put in new spark plug the reeds look ok and have cleaned the carb out like 5 or 6 times no trash in carb and tried unplugin the tor system. still wont idle any ideas please