The pressure regulation valve on the rail sometimes causes this problem.
I would look at the metering unit on HPFP (if it's second hand) or the rail control valve.
A very poor remap can do that as well.
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-2014 328d Wagon, 8HP. Self-tuned, 270hp/430ft-lbs.
-2019 M2 Competition MT, Alpine White. Self-tuned 560hp
-2016 Mini Cooper S, MT. Many plans.
Others:
-E36 328is. 2000 Z3 Roady. 2003 VW Jetta TDI Manual. Estoril Z3M Coupe.
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