Weak start and shuts off on Idle

Good morning.

The fuel pressure regulator is part of the fuel pump assembly. You can just replace the regulator but since you are going to have to remove the pump, I would replace the pump assembly.

As far as the stalling, it may just be the throttle plate containing dirt and clogging up the passages.

Roy

https://www.2carpros.com/articles/throttle-actuator-service

https://www.2carpros.com/articles/engine-coolant-59420607

1. PRECAUTION

NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notice before proceeding with work See: Vehicle > Technician Safety Information > Repair Instruction - Precaution.

2. DISCHARGE FUEL SYSTEM PRESSURE

See: Fuel Delivery and Air Induction > Technician Safety Information > Fuel System: Precaution

3. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

4. REMOVE REAR SEAT CUSHION ASSEMBLY See: Seats > Removal and Replacement > Removal

5. REMOVE REAR SEAT CUSHION LOCK HOOK See: Seats > Removal and Replacement > Removal

6. REMOVE REAR FLOOR SERVICE HOLE COVER

(a)Remove the rear floor service hole cover.

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(b)Disconnect the fuel pump connector.

7. DISCONNECT FUEL TANK VENT HOSE

(a)Pull the tabs of the retainer to disengage the lock claws and pull out the fuel tank vent hose.

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