I have a 19hp Kaw (on a Toro)with only 34 hours on it. At the end of the season I noticed it was getting a little harder to start. When I went to service it for the winter It took like 15min to get it going. Once running it would run rough for 30 sec. then run fine. Next day could not get it to start. It will crank, you can smell fuel but like it was not getting any spark. Would not fire on starting fluid. Once or twice it would just hit a little like it had gotten spark for just half second. Mower is under warranty so off to the dealer it went. Sat their for two weeks. Called today wanting to know what the problem is. They have been starting it all day with no problem. Any idea of what it could be. A bad part???