Update
Reattached the vent tube (by feel), reassembled everything. Same exact response. Running on 3 cylinders. Got my Durametric today. No codes. I do feel this is air/vacuum related at this point. But to really see the PCV valve, the airbox needs to come out, and to get to the other end, I need to get under that input manifold. So, the excitement has quelled. On to get things done.
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