Toro Lawn Mower With Toro Power Tools "boy spark" Questions

spark plug GROUND. Let's say you got some shocking results from grabbing onto that bad boy. NOW check where the plug meets the cylinder head when she is screwed down in there. Believe it or not.....if

spark plug,new air filter,fresh gas. Mower is lawn boy brand with accessary sensor on rear panel-thinking this may be the culprit. Haven't pulled the flywheel yet. If the engine is running at all then