This is not related to a mower, but given the small engine savvy in this forum, I hope you guys won't mind commenting on the problem I'm having with my John Deere Gator 825i. I have a reasonable amount of experience troubleshooting EFI car and truck engines. This buggy has an 825cc. Chery, 3 cylinder EFI engine. It has individual coils on the end of the engine. There is no indication of a code being set, but although my scanner will connect to the connector under the dash, it turns out that John Deere has proprietary software so my scanner won't work. One month after the warranty expired, it developed a missing cylinder. I pulled the plugs and found the center one fouled. I cleaned it and the miss went away temporarily. I then used a stethoscope while it was missing and could hear all the injectors clicking normally. Although in my fifty years of messing with engines, I've only seen one spark plug that was actually bad, I swapped the number one and two spark plugs and the foul stayed with the center cylinder. I then swapped the coils between number one and the center cylinder and gave it a hard run. After it warmed up real good it began missing. I brought it back to let it cool before pulling the plugs and thought sure that I would see the number one plug fouled instead. It had been intermittently running well, and what I found was traces that the center cylinder had tried to foul, but couldn't confirm. I plan on giving it another hard run to see if I can get a consistent foul so that I can confirm which cylinder is now fouling, but at this point it appears that the center cylinder is the culprit even with the swapped coil, but remember, I have not totally confirmed this. Also, when running it at speed, when the miss develops, I get a popping and snapping from the exhaust, which seems to indicate that unburned fuel is making it into the exhaust and causing this. Any experience with a similar situation? Thanks for sharing your savvy and experience.