Rough Idle

Check:

1. Electronic Air Control Valve (EACV) (14)
2. Other Idle Controls
a. Hoses and Connections
b. Electronic Air Control Valve (EACV)
3. Emission Control System
a. Exhaust Gas Recirculation (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 (3)(5)
6. Exhaust Gas Recirculation (EGR) Control System (12)
7. PGM-FI Control (ECU) Unit (BU)

NOTE:
After each symptom, the system that could be the source of the symptom are listed and should be checked in the order they are listed, beginning with #1.

(BU) code used when the CHECK ENGINE warning light is on, and the self-diagnosis indicator LED is ON with no "blinks", the back-up system is in operation.

Self-diagnosis indicator, (LED) blinks (?), will follow associated systems.