Hey guys, was hoping to get a little advice about my mower. I have a JD 717a with about 371 hrs on it. It has the Kawasaki 19 hp FH601V engine. Well for the past year or so Ive been having some sputtering when I start up or during normal use, mainly from the transition from low idle to high idle. Before this season started, I put 2 new spark plugs on it and did the standard oil change, new blades, etc. Well the mower was running like new for about 2 weeks. Then about a week ago it started doing the same symptoms again, sputtering from the transition to low to high idle. I checked the spark plugs and they didnt appear to be fouled.. When it started to sputter again, I took the boots off of each spark plug... when I pulled the one on the right side it kept running, but when i pulled the boot on the left spark plug the mower died. I checked my connections and everything was good, so does this mean it could be my right coil going bad? I've read how you can check it with an OHM meter..does anyone have any instructions for this? The mower runs fine when i can get it to full throttle...and it never completely dies until it sputters and i take the spark boot off the left spark plug... Any thoughts?