DEFINITION: Engine power variation under steady throttle or cruise -- Feels like vehicle speeds up and slows down with no change in throttle position.

Misfire Counts

Check misfire counts using a scan tool (if any exist).

Torque Converter Clutch (TCC)

Verify proper TCC operation and customer understanding of TCC.

A/C Clutch

Verify proper A/C clutch operation.

Fuel Trim Values

Exhaust Gas Recirculation (EGR)

Check EGR operation.

Generator Output Voltage

Check voltage.

Vacuum Lines

Check vacuum lines for kinks or leaks.

Fuel Pressure

Check fuel pressure.

Spark Plugs

Check spark plugs for cracks, wear, burned or heavy deposits on electrodes.

Fuel

Check fuel quality.