Fired her up on a cold start this morning with the MAF disconnected and it didn't want to run, plugged it back in and it idled good for a while until closed loop. I scanned it again and finally got a code for the DME, 'DME Signal, hot-film mass air flow sensor'. So it looks like I was on the right track. I have a Cardoni MAF showing up today but I'm going to order a separate Bosch or Delphi sensor just to have. I don't trust cheapo parts but I've had decent luck with Cardoni products in the past. Hopefully this solves it.

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Patience is a virtue. I have neither.

2002 X5 4.4