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 LBZ/LMM Fuel Pressure Regulator
Fuel Pressure Regulator Bolts
Upper Radiator Pipe Seal
EGR Tube Gasket
EGR Tube to EGR Valve Gasket
Intake Tube Gasket Kit