So took two weeks to get my Mahle fuel filter from Pelican. Fuel filter in and my 80psi, is now reading 50psi. Drove the car 300 miles and an hour in stop and go due to a crash, no issues at all. Car has not stalled. My negative fuel trim seems better. Gas mileage is good. However, I still see the rpm bouncing a bit and the fuel economy gauge swing to the right when slowing, then move to the left. The fuel economy gauge did this on my 2006 so maybe that's normal, but the rpm bouncing is still a bit odd. I don't feel it on the car, but I've been so focussed on the rpms, I see it. It's not like the car hesitates at all or surges forward. So I'll see how that develops but I believe it's unrelated to my stalling. The stalling was at lower speeds than the bouncing rpm speed.

Now - this is the biggest mystery. The stalling was happening before the bad Hengst Fuel filter was installed by the mechanic when I was having surgery and wanted the car tuned up before a small road trip upstate to fish salmon. Then after that new fuel filter, the stalling actually got worse. So maybe this isn't quite the end of the story. Maybe the bad fuel filter just made things worse, but there is still something wrong but not presenting itself as frequently. Meanwhile, I've replaced.most other stuff with OEM parts, so only time will tell.

I'll report back after another 1000 miles. Appreciate everyone who chimed in.

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2003 X5 3.0i Silver (build 07/03)
2006 X5 3.0i Blue
1977 Ferrari 308 GTB
1994 Ferrari 348TS Speciale #14/15
1989 Ferrari Testarossa