I own a 2012 TZ1 LXR (non-turbo). My issue is that it will not start without touching the throttle. You have to keep the throttle just slightly pressed for the sled to stay started. Once warm-up is complete it usually stays started but is only idling between 800 - 900 rpms. I have only used supreme gas in this sled and the plug have been changed which have not solved the issue. Any suggestions??