A Symptoms

IMPORTANT PRELIMINARY INSPECTIONS BEFORE STARTING
Before using this section, perform the Diagnostic System Check - Computers and Control Systems and verify all of the following conditions:
- The engine control module (ECM) and the malfunction indicator lamp (MIL) are operating correctly.
- Diagnostic trouble codes (DTCs) are not stored.
- The scan tool data is within the normal operating range. Refer to Scan Tool Data List. Scan Tool Data, Normal Values and Definitions
- Verify the customer concern and locate the correct symptom. Inspect the items indicated under that symptom.
- Several of the symptom procedures ask for a careful visual/physical inspection. This step is extremely important, and can lead to correcting a condition without further inspections and can save valuable time.
- If the intermittent condition exists as a start and then stall, inspect for any DTCs related to the theft deterrent system. Refer to Diagnostic System Check - Computers and Control Systems. Initial Inspection and Diagnostic Overview
- Verify the proper installation of any of the following non-original equipment accessories:
- Lights
- Cellular phone
- Remote starter system
- Non-factory installed alarm.

1. Use the following tables when diagnosing a symptom concern:
- Poor Fuel Fill Quality
- Hard Start
- Surges/Chuggles
- Lack of Power, Sluggishness, or Sponginess
- Detonation/Spark Knock
- Hesitation, Sag, Stumble
- Cuts Out, Misses
- Poor Fuel Economy
- Rough, Unstable, or Incorrect Idle and Stalling
- Dieseling, Run-On
- Backfire

2. If the condition can not be isolated using the appropriate table, refer to Intermittent Conditions for further diagnosis. Intermittent Conditions