Misfire/Rough Running

Check:

1. Fuel Supply
a. Fuel Injector (16)
b. Injector Resistor
c. Pressure Regulator
d. Fuel Pump
e. Contaminated Fuel
2. Manifold Absolute Pressure (MAP) Sensor (3)(5)
3. Crankshaft Position/Cylinder Position (CKP/CYP) Sensor
4. Idle Air Control Valve (IAC) (14)
5. Emission Control System
a. Exhaust Gas Recirculation (EGR) Control System
6. 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.