Just came in after testing fuel pump pressure. Rained yesterday, and my rotator cuff injury made using my right arm impossible, until late in the day, so this is all I was able to do. Even so, I had to get the wife to press the accelerator (her first time behind the wheel of the X5).

today
here's results from 5-11-22

Absolutely identical, so where does the change from a smooth running, no misfires or stalls (but with lean fuel trims) engine three years ago (and as late as 2 weeks ago, before the fuel pump failed)), to the smooth running, no misfires (but with stumbles and semi-stalls, and rich fuel trims) engine come from?

Only the fuel pump was changed, but the fuel pressure test today shows that it is providing the SAME pressure as the old one did, before it died. Nothing else was touched (mechanically), and only the adaptations were reset. But, though I had reset adaptations on my X twice before, there were no drivability problems, afterwards.

Should I pull out the new fuel pump, inspect the triple hoses (which I never touched) and see if one or more isn't sbmerged in gasoline? That's the only possibility I see, that may be causing problems.

But, I'm in over my head in this situation.

Only difference is

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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide