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The Catera has a history of stalling/cutoff issues. Many are solved with the replacement of the crankshaft position sensor. It does give the symptoms you describe. I would try that first as it is fairly cheap and easy to replace. If the problem persists after that, you've at least removed one potential possibility.
This is the description of the crank sensor from AUTOZONE (cost $44.99 USD)
The crankshaft position sensor identifies position of the crankshaft to the ignition control module (ICM), engine control module (ECM) or powertrain control module (PCM)
When not replaced, vehicle may experience no start, hard start, intermittent engine shut down, misfire, engine cut out, excessive fuel consumption, CEL illumination and/or failed emission test
Proper alignment, positioning and spacing for faster, easier installation
Designed to meet or exceed OE specifications in form, fit and function
sounds like no fuel pressure, I had the same problem . theres a molded fuel line between the pump and sending unit inside the tank that was split. , Basically I had a fuel leak inside the gas tank, 2 test pressure the connection is on the fuel rail behind the motor , it should be 40-50 psi
I had my car put on the machine for a cat scan and it turned out to be one of my crankshaft sensor was going bad.... could not tell rather it was the upper or lower failing so I had both change to be on the safe side.I just got the car back and it seems to be running fine.Thanx for your help