Have a 2003 500 auto that has stopped running, hope you guys can help. It will just crank over, I have changed the plug, drained the tank and put in new gas. It has been sitting for about 4 months. I have checked and the carb is getting fuel but will not start. But if I spray some starting fluid into the carb it fires right up then stops. I think i have some kind of carb problem maybe?.