Hesitation/Sag/Stumble

1. Malfunctioning ECU.
2. Malfunctioning ignition system.
3. Faulty pressure exchange solenoid valve.
4. Malfunctioning atmospheric pressure sensor.
5. Malfunctioning intake air temperature sensor.
6. Damaged or disconnected vacuum line.
7. Broken, shorted or improperly secured harness connector.
8. Malfunctioning air flow sensor.
9. Malfunctioning engine coolant temperature sensor.
10. Malfunctioning throttle position sensor.
11. Stuck EGR control solenoid valve.