Craftsman won't die!!!!!!

I have a Craftsman with a CV15S engine and I pulled it in the garage and raised it up and sharpened the blades. When I let it down it would not run; it would turn over but it wasn't getting any fire to the spark plug. When I took the kill wire loose from the coil to test the coil THEN the engine would crank and run. The mower wouldn't turn off with the key; I had to hook the kill wire back up to kill it. I'm looking for any solutions because I'm stumped!!!!!!!!