Sled starts good when its cold, 2-3 pulls. Works good. Then after a stop on the trail for about 10 - 15 minutes it doesn't want to start. Have to hold the throttle wide open, and when it starts it has a low idle and you have to feather the throttle to get it up to normal. Then it runs good again. Just wondering if someone knows of a specific problem that would cause this. Thanks.