After Warm Up

CHECK:

1. Idle Adjusting Screw
2. Fuel Pressure Regulator
3. Idle Air Control (IAC) Valve
4. Exhaust Gas Recirculation (EGR) Valve
5. Barometric Pressure (BARO) Sensor
5. Engine Control (ECM) Module

NOTE: The system that could be the source of the symptom are listed and should be checked in order, starting with #1.