Rough Idle

SYMPTOM:
Rough Idle
CHECK
1. Electronic Control Unit (*)
2. Fuel Injectors (16)
3. Manifold Absolute Pressure Sensor (3) or (5)
4. Electronic Air Control Valve (14)
5. Positive Crankcase Ventilation System

Numbers in parantheses are the blink codes displayed on back of the ECU. (*) LED on the ECU is not on, or stays on without blinking. See [NOTES ON READING DIAGNOSTIC LIST] Article for more information. For ECU trouble code component testing procedures see [COMPUTERIZED ENGINE CONTROLS].