So I was performing some maintenance on my 1990 90-hp Force and ended up getting a little zap when I touched the spark plug wire while the engine was running (who knows why I did it). To be specific, I touched the outside of the cover over the spark plug itself, and was zapped through the cover. It was not a bad zap, but was unexpected. Is this normal or do the spark plug wires need replacing? Or is it a sign of poor grounding?