I have a Kohler 18 command on a Turf tracer. I ran the mower one evening (ran fine) and the next morning it was running on one cylinder. I know it's on one cylinder cause I pulled the boots and it shut down when I pulled the left boot. So, I purchased a new coil for $48.00 thinking this would "fix". No go, it's still on one cylinder, any ideas. Thinking of stuck valve? I did see spark arcing off of the boot when it laid against the metal on the engine body.