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Whoops, I knew I’d forget something: about 141k miles on the car, so relatively young for its age. Engine and transmission are original.
My scan tool does do live data, and I’ve got a bluetooth scan tool to pair with my tablet for logging as well. I’ve tested the MAF and it seems fine – smooth response to throttle, no weird fluctuations at idle or while driving around. Short term fuel trim seems to follow O2 voltages normally. Fuel trim on both banks is actually pretty normal (~+/- 5% LTFT).
I’m stumped. The only obvious issues right now are an idle that’s slightly rough and a little bit inconsistent in drive. The car isn’t idle hunting, but I have noticed that it doesn’t generally fall back to the same idle after coming to a stop or switching between park and drive. The idle varies between 600-800rpm, becoming noticeably rougher when it decides to idle at the lower end of that range.