So I just got my jeep back and it's missing a vac tube. It has one going to the Brake Booster, one going to the Valve Cover, one capped and the other is just there, my RPMs are hanging out between 1500-2k when I put my thumb over the open one it throttled back down to normal. This open port is a bigger one. I looked around and saw no tubes hanging free. Any info would be great, Pics would be better Thx in advance !