Mine started doing that crap and went down hill from there.
Coil would be the first thing. I hope that's all but of all things, my dang freeze plugs had to be replaced. Thought everything was fine. I had to spray a little starting fluid in it until it would stay running then all of a sudden water went everywhere. Three hundred in labor and 2 dollars in parts. Then the leaks started everywhere and hoses... One thing after the next. Finally broke down and bought a new one. Got tired of losing days working on the tractor instead of working on my place.
Hope that is not your trouble.