Car stalls

Hello, sorry to hear about your issue. You're going to have to see if it's actually fuel pressure dropping off while the car is having its problem. It's a matter of determining what you're losing during the malfunction, either spark or fuel pressure. Having a fuel pressure gauge on there while its not starting will tell you the tale, fuel pressure spec is 47psi. There could be a bad connector at the fuel pump that's loose and working sometimes and other times its not . But test the pump when it's installed in the car, bench testing it is not sufficient. It needs to be a loaded test with the proper voltage applied at the connector. Let us know what else you find.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you are able with a scan tool to look at the live data stream, this would be very helpful in determining what's going on. I would have the engine computer scanned for diagnostic codes as well, just to see if there's anything stored in memory. A code can give you a better idea of what the computer is doing, and the reason for the stalling issue.

You didn't have any pressure on the fuel pump test? If you had no pressure at all you're going to want to make sure the pump is getting power and good ground before condemning the pump.