HELP! Engine idles high then bogs down

i was talking about the end of the video that he ran it without woodruff key.As for the tors id rather have someone else that has more experience tell you about that mine is 05 i think the one in video is older then 03 sooo its different???
 
Would it still start and run with broken woodruff?
It could run with a broken key if the flywheel has not rotated a lot.

All the key does is to allow you to put the flywheel in the correct place, it is the torqueing of the flywheel at 53 ft lbs onto the tapers that stops it from spinning.