Just read through this.
With a wideband and datalogging through UpRev, the problem should be pretty easy to find.
This does not read like a fuel pressure issue if you ask me. If you have a stock tune to put back in, that is a possible start. Perhaps its even just something they messed with in the throttle table? I dont know who tuned the car. But I would log the throttle positions and accelerator positions for sure.
Basically everything the post above me says to watch.
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