Okay guys, here's the latest: Just put a vacuum gauge on it by disconnecting the PCV hose from the PCV valve and attaching the gauge to the open end of the hose. Started the engine which immediately went to high idle. The vacuum needle was wobbling quite significantly, perhaps through a 2-3 psi range. It was definitely not still or steady. As the engine warmed up on high idle, the vacuum increased to 18 - 19 psi and still wobbling through a 2-3 psi range. Kicked it down to curb idle, where it read 14 - 17 psi with significant wobbling at 780 RPM. Not steady at all. Momentarily accelerating the engine drove the vacuum down to zero, then returned as the engine settled back into idle. Tried to attach a video to this reply but it wouldn't work. Never at any time saw a steady vacuum reading. Rapidly wobbling 2-3 psi all the time. Thoughts?