Opened the CKP sensor cover, saw a few metal flakes stuck to the magnet and blew them off. Otherwise, looked pretty good.
Ran the manual's ohmmeter tests that I could with my conventional meter. All good. I haven't had a peak-voltage reading meter in a long time and I'm not getting one today.
Again, no visible problems with the connectors.
Still gets the C24-27 code when the throttle opened up a fair amount. Also noted is more popping in the exhaust than I would expect from a stock system, for whatever that's worth.