Thanks, Klaus - good info. I did some reading and I saw it explained that there are actually two sources for vacuum for the PCV system. One source for idle (possibly the intake manifold?), and then the intake tube source for cruising with open throttle. That would explain the reason for the electrial connection on the PTC as you describe. My guess is that the PTC opens when opening the throttle?? I didn't have an assistant to help me check for vacuum with open throttle, however, I know the vacuum test failed at idle, so I'm thinking there is another vacuum source somewhere that is likely clogged. Anyway, I'll check out what you suggested and see how it goes.