Can you check O2SAT? Or if not, can you get a signal reading from the O2 sensor before/after while you're running, and one test signal after fresh start with it unplugged, one fresh start with it plugged in. 4 total numbers.
Also - if you have a way to see your vacuum readings, do me a favor, engine brake at about 4k rpm, no throttle, and tell me what your vacuum readings are. That's a side project, though.
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