Update... Resealed the intake - no changes.
Hooked up PC version of RoverGauge, here's the log (from running in front of my house to parked in front of my office):
View attachment 61058
Check this: everything seems to work while driving. But when I stop, in gear or not, I have to open up the idle bypass screw - otherwise the idle becomes unstable and the engine will eventually stall. The graph represents the drivable settings - the idle still oscillates a bit (see below), but the IAC solenoid would quickly close, and short-term trims would go up to the max.
View attachment 61059