ok so today i decided to get ready for inspections and shit, so i slapped on the stock cat. on there. after turning it on i noticed i heard a random "tick" like from a spark. i didnt see anything sparkin so i knew it was misfiring or something, the car has been misfiring slightly but nothin too serious, today was the only day i heard this spark "tick" i started to push the plugs into the coilpack, to make sure everything was fine, wen i touched #6 i got shocked. the timming on the car needs to be worked on....and im gettin code 51....anyone have any input on this? again i've never noticed that sound before.