Sounds fuel related to me..

Did you recently buy fuel that may be bad? I once purchased 20 gallons of gas and got 10 gallons of water. Not cool.

Maybe the fuel filter is clogged?

I would measure the fuel pressure at the fuel rail first.

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2001 X5 4.4i Sport
2013 550i Xdrive M Sport
2000 528i E39 (Sold)
Unleashed Air Racing 279 mph Best Average Speed