After reading several spark plug threads I decdided to swap out my old plugs for some coppers. Things were going fine and I was finishing putting things back together. I tightened down the right bolt on the throttle body. As I tightened the next bolt down it started to get a little hard to turn and then all of a sudden very easy. This was because the bolt snapped with part of it still in the plenum thread. What can I do? Can I drill out the piece of the bolt and then try to rethread the plenum? Any help would be greatly appreciated.