Rough Idle

Check in the Order Listed:

1. Idle Air Control Valve (IAC) (code 14)
2. Idle Control System
a. Hoses and Connections
b. Idle Air Control Valve (IAC)
3. Emission Control System
a. Exhaust Gas Recirculation [1] (EGR) Control system (12)
b. Positive Crankcase (PCV) Ventilation System
4. Fuel Supply System
a. Injector Resistor
b. Fuel Injector
c. Contaminated Fuel
5. Manifold Absolute Pressure (MAP) Sensor (code3, 5)
6. PGM-FI Control (ECM) Unit (BU)

NOTE:
(BU) code used when the MALFUNCTION INDICATOR WARNING LAMP is on. Jump the service check connector, if no code is displayed (MALFUNCTION INDICATOR WARNING LAMP stays on steady), the back-up system is in operation.

Self-diagnosis indicator, (MALFUNCTION INDICATOR WARNING LAMP) blinks (?), will follow associated systems.

[1] Applies only to Vehicles with EGR Valves.