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Q: Why does my engine die after running 10 seconds but will restart & run for 10sec on 1993 Mazda Protege

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The car starts with no problem and runs perfect for about 10 seconds then it dies. It seems like it runs out of fuel. I installed a new fuel pump. Jumping the diagnostic box and the pump runs and generates 48PSI but when the engine runs there is less than 20PSI. I installed another pressure regulator but nothing changed. I wonder if a bad vacuum solenoid would cause this condition? I'm not certain how to test for that.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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