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Fillpipe Restrictor > < Exhaust Pressure Regulator (EPR) PWM Valve Solenoid

K 2500 Suburban 4WD V8-5.7L VIN R (1999)

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Exhaust Pressure Regulator Vacuum Valve: Locations
Exhaust Pressure Regulator (EGR) Solenoid

Top LH center of engine, above Valve Cover

Fillpipe Restrictor > < Exhaust Pressure Regulator (EPR) PWM Valve Solenoid