Rough Idle

Check:

1. Idle Control System
a. Hoses and Connections
b. Idle Air Control Valve (IAC) (14)
2. Fuel Supply
a. Fuel Injector (16)
b. Fuel Injector Resistor
c. Contaminated Fuel
3. Emission Control System
a. Exhaust Gas Recirculation (EGR) System (12)
b. Positive Crankcase Ventilation (PCV) System
4. Manifold Absolute Pressure (MAP) Sensor (3)(5)
5. PGM-FI Control (ECM) Unit (BU)

NOTE: All items should be checked in the order in which they appear. A (number) after the component indicates the fault code associated with that system. If BU appears on with PGM-FI unit, it indicates the vehicle is running in back-up mode.