A Important Preliminary Checks

Perform A Powertrain On Board Diagnostic (OBD) System Check before using the Symptom Tables, and verify all of the following are true:
^ The PCM and MIL are operating correctly.
^ There are no DTCs stored.
^ Ensure that the engine coolant temperature is not above 130°C (266°F). This condition causes the PCM to operate in Engine Coolant Over Temperature Fuel Disabled Mode. While in Engine Coolant Over Temperature Fuel Disabled Mode, the PCM turns the fuel off to three cylinders at a time in order to keep engine temperatures from reaching damaging levels. The system perceives Engine Coolant Over Temperature as a lack of power, miss, or rough idle. If the vehicle is operating in Engine Coolant Over Temperature Fuel Disabled Mode, refer to Engine Overheating. Symptom Related Diagnostic Procedures
^ Verify the scan tool data is within the normal operating range, refer to Scan Tool Data List. Symptom Related Diagnostic Procedures
^ Verify the customer concern, and locate the correct symptom in the table of contents. Check the items indicated under that symptom.