I was installing my new throttle body today... their are two pieces on the old throttle body one is bottled on, the other is screwed on. Well, the screws to the smaller piece are stripped and I am having trouble taking it off. I am taking it to a shop tomorrow to get it off, but I was wondering what these two black pieces are. Are they sensors of some sort? And what would happen if they weren't on? I'm not gonna take them off, just in a question asking mood...