Originally Posted by ProbeGT-ZE

Let's think about this for a second. If you've ever worked on a OBD1 D-Series engine (I'm sure most of you have) you'll remember two metal hardlines that were connected to eachother. One supplies coolant from the IM/Head to the TB and the other is a connection from the intake tube to the valve cover. CRAZY thing is they look exactly THE SAME! If his friend wasn't familiar with this, or wasn't paying much attention after they remove the metal section all that's left are reinforced rubber lines. He probably remembered one's coolant one's vaccuum and just connected them. I can see how this could have happened.