I have a 1998 Sportsman 500 that is pulsing at idle. I had been running the machine without a battery for about 2 years and recently bought one to put in and when I started the machine it began pulsing at idle. I disconnected the battery and the machine runs and idles fine. With the battery connected the throttle is very sensitive which leads me to believe its an issue with electronics. Any tips or information on the subject would be helpful thanks.