JD 112 doesn't start. Is it the coil?

My John Deere 112 quit while I was mowing. Wouldn't start up again. Embarrassingly, the oil was really low. I added oil. Still wouldn't start. Walked away 15 minutes. Came back, and it started. Ran it 2 minutes, engaged the PTO and it quit. Now it won't start at all. The engine does turn over though. I replaced the sparkplug. Now with the new plug, I don't see blue spark, but when i touch it, I can get a heck of a shock.

I tried spraying starter fluid in the carb, still won't fire up.

I would be very appreciate of any ideas. Thanks