Poor Fuel Economy

Check the following:

• Check secondary ignition system.
• Check PCM power and ground circuits.
• Check engine vacuum.
• Check fuel delivery.
• Check fuel pressure.
• Check Engine Coolant Temperature (ECT) sensor calibration.
• Check Throttle Position (TP) sensor calibration.
• Check Manifold Absolute Pressure (MAP) calibration.
• Check minimum idle airflow.
• Check oxygen sensor switching.
• Check oxygen sensor heater.
• Check Idle Air Control (IAC) motor operation.
• Check engine mechanical condition.
• Check evaporative system.
• Check EGR system.
• Check Intake Air Temperature (IAT) motor operation.
• Check Park/Neutral Position (PNP) switch.