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Q: Fuel Pressure on 1994 Lexus SC300

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Does anyone know what the fuel pressure is suppose to be on a 94 Lexus SC 300?
When vehicle is idling it should be 28 to 34 psi.

When vehicle is idling and vacuum hose disconnected from fuel
regulator it should be 38 to44 psi

Fuel regulator is on the fuel rail,round small canister with vacuum hose
connected to it.
So the engine stumbles and then dies. Can't keep it running. Should I rule out the fuel filter and go with a new fuel pressure regulator?
I just bought a new fuel filter thinking I would start with the least expensive first. Hopefully that will take care of it. I've heard it's kind of a pain to replace. Should I have my local mechanic do it?

FUEL ECM IN ON DIVER SIDE BEHIND THE PANEL. it has come control over pressure depending on engine speed, which has,
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