Misfire or Rough Running

SYMPTOM:
Rough running or misfire.

CHECK:
1. Electronic Control Unit *
2. EGR Control System (12)
3. Electronic Air Control Valve (EACV) (14)
4. Manifold Absolute Pressure Sensor (3)(5)
5. Throttle Angle Sensor (7)
6. Fuel Supply

NOTE:
Numbers in parentheses are the blink codes displayed on the back of the ECU.
* LED on the ECU is not on, or stays on without blinking.