I have a 99 GTX Limited which will randomly rev to max throttle and stay there. I try to press the start stop button and pull the kill switch and it doesnt shut off. Throttle lever does not respond when this happens. I have to choke it to get it to turn off. When I start it back up it runs normal (throttle lever works, off switch works, and kill switch works) until I get about half way down on the throttle lever and then it goes wide open again and the off switch, kill switch and throttle lever do not work. Im first concerned the kill switch does not seem to work. Second the on off switch doesnt work when this happens. Third why is it go wide open? Any ideas on how to test these three issues would be greatly appreciated.