Repair a surging or lopey idle with a new fuel pressure regulator.
You will need to remove the turbo inlet pipe and upper radiator pipe for installation.
Duramax LLY Fuel Pressure Regulator
Fuel Pressure Regulator Bolts
Upper Radiator Pipe Seal
Intake Tube Seals
EGR Tube Gasket
EGR Tube to EGR Valve Gasket
Intake Tube Gasket