Thanks, old_man.
The trouble is that I think my PCM may be bad. I've done lots of tests and never gotten a check engine light except when turning the key to "run". There's awful misfiring in the 2000-2500RPM range when manifold vacuum rises while I let go of the gas to even out after accelerating. Probably when switching from open (accelerating) to closed (cruise).
Since I haven't been able to index my camshaft sensor properly (No scanner. I followed the FSM as far as I could go and then advanced it to the point where the engine starts ok and doesn't stall.), this could be the cause.
I opened another thread about "camshaft indexing", but there are no ideas yet.
On the other hand my O2 1/1 sensor seems to be shot too, since it reads over 1.5V at the PCM connector on a warm idling engine.
Any ideas, anybody?