Hey guys I've been searching and can't really find an answer to my problem. I've got an f3 that when it has been sitting for awhile it does not want to start or will start then die. Also it has a real bad hiccup when it is sitting running and you blip the throttle. Sometimes it is so bad it will die. We changed the plugs, the fuel pump(it died), and the carbs have been taken apart and were clean. Any ideas?