Recently while mowing I've noticed the Kubota gas engine cutting out occasionally. I figured it was a fuel problem and added some fuel conditioner to the tank. Yesterday I went to back the gh out of my shop. It started fine and backed up 10' then died. I tried to restart the gh with no luck. Again my first thought was fuel problem. I pulled the fuel line at the carb and had good flow. Normally you can start the mower with the parking brake on and travel levers out. I believe this bypasses all of the safety switches. The battery has 12.8 volts, engine turns over normally however there is no spark at plugs. Any members experience this problem or have any ideas?