I tested the X on my 10 mile course around the house, then followed that by taking videos of my dashboard display.

The X never stalled out, but stumbled four times, this time only on right turns and curves. I intentionally over-accelerated and whipped around them, just for maximum effect.

The STFTs at some points were as high as -28.5, again, while the LTFTs were between -7.03 and -8.59 (they were both at -8.59 when I started the drive). I took two videos of the display when i first returned to the driveway, and after awhile, I reset the MAF, and took two more. i don't understand the patterns shown by the O2 sensors, but when i graphed (and lost the graph) them on the drive, they looked better.
https://drive.google.com/file/d/1t1H0O_RWlMctlTFndLeEVYnGmQEWBmOI/view?usp=sharing
https://drive.google.com/file/d/1PvfjK_tS9LvAsc0x-y-7ggptoDl432Y3/view?usp=drive_link

https://drive.google.com/file/d/1WqaZFVs7dAIWNGdcyhTJwZgjeoFwNEY0/view?usp=sharing
https://drive.google.com/file/d/1G3F...ew?usp=sharing
The first video had throttle% on the left, but the other three had RPMS in that space. i hope they'll open for y'all.

finally, I took a pic of the emission monitors, and there are still three incomplete (before I reset the MAF). If only one had remained, then I'd take it in for inspection and to heck witth the stumbles. The wife is going out of town tomorrow, so I won't be test driving until she gets back, so i have time to sit, think, and curse my fate.

__________________
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