2004 Buick Lesabre uptake regulator

Not sure if you are looking for upper intake manifold or fuel pressure regulator
but this should cover both

Intake Manifold Replacement - Upper
Removal Procedure
Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement
Disconnect the manifold vacuum source.
Remove the evaporative emission canister purge solenoid valve and secure the hoses to the air inlet grill.
Disconnect the right spark plug wires from the ignition module and position aside.
Remove the MAP sensor.
Remove the engine wiring harness heat shield fasteners.
Remove the engine wiring harness heat shield.
Remove the fuel rail mounting bolts and the fuel rail with the injectors.
Remove the throttle body support bracket bolts.
Remove the throttle body support bracket.
Remove the air cleaner intake duct. Remove the nuts securing the throttle body to the upper intake manifold.
Remove the throttle body and position aside.
Remove the throttle body gasket.
Remove the upper intake manifold bolts.
Remove the upper intake manifold.
Clean and inspect the upper intake manifold.
Clean the lower intake manifold mating surface.

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