Hesitation/Sag/Stumble

1. Accelerator pump malfunction.
2. Choke valve remains open during cold engine operation.
3. Choke valve remains closed with engine at normal operating temperatures.
4. Clogged main jet.
5. Clogged enrichment jet.
6. Abnormal secondary valve operation.
7. Malfunctioning feedback solenoid valve.
8. Malfunctioning vacuum switch.
9. Malfunctioning timing control system.
10. Malfunctioning engine coolant temperature sensor.
11. Malfunctioning throttle position sensor.
12. Malfunctioning engine speed sensor.
13. Malfunctioning cold mixture heater relay control system.
14. Broken, short circuited or incorrectly connected harness connector.
15. Malfunctioning air conditioner power relay control system.