A couple of clips from today. It actually starts much quicker today, but still rough and it will 100% die, if I don't blip the throttle at the right time.
The only thing I can thinks of that is different today is a much cooler ambient temp (16C/61F) compared to the previous weeks where it was around 25C/77F or more when I previous tested starting up the car.
I have a fuel return system. Not sure if that is why the fuel system doesn't maintain pressure when I go from ACC to ON. It quickly jumps to 50ish psi and then immediately drops to 0 again.
Cold engine (car had been sitting for a few days):
Warm engine (75C/167F - drive around a little and parked it for 10 minutes prior to firing it up again):
Pressure seems a bit low in the second video clip (warm idle), does it not?