Engine Surges While Cruising
- Check intake manifold vacuum. Vacuum should be more than 17.7 in. Hg at idle.
- Check Throttle Position (TP) sensor.
- Check Oxygen sensor.
- Check for normal Vehicle Speed Sensor (VSS) signal to Engine Control Module (ECM).
- Ensure Engine Control Module (ECM) terminal voltages are okay.
- Check throttle linkage operation.
- Check air filter element.
- Check fuel system pressure.
- Check for restricted exhaust system.