I used a mechanics stethoscope on each injector and they are alol making a tapping sound as they should but I haven't actually taken them out as yet. I read that I can test they with a multi meter as well?

On the ICV I did clean it, see it shake properly, and do hear w a scope that buzzing prior to starting the car.

The previous owner said he checked everything as well, as did the dealer and no dice.

I'm wondering if a DME re flash would do it if everything else is ok? Im tempted given my frustration to bring it to a dealer where I live in Maine and have them have a look at it. Given the area they see a lot of X5's...

I do however feel like injectors would be the last unknown... Any thoughts on further testing them? Trying to figure if I multi meter test them, or my scope sound test is good enough, etc. don't want to check something and cross off the list with being 100%.

Going to try swapping 02 wires rear left to right now... They are Bosch I believe...

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'06 Bmw X5 3.0
'97 Bmw 328ic
'12 Porsche 911 C4S
'85 Porsche 944
'02 Porsche Boxster S (sold)
'10 Mercedes Sprinter RV ( sold)
'05 Jaguar XJR (sold)
'05 Bmw 545i (sold)
'03 Bmw 540it sport wagon (sold)
'01 Bmw 325ic (sold)