Hello everyone, I am new here and looking for some help. First post. I have a 1999 John Deere LX 255 riding lawnmower. Kohler engine, 15hp I believe. After using it for about half an hour it just dies and won't start. Then if you let it sit all night or for a few hours it will start right back up. It has started doing this in the past few weeks. To me it seems like some type of ignition problem but I am no expert on these. Any ideas? Thank you.