During Warm Up

CHECK:

1. Fuel Filter
2. Fuel Injector
3. Fuel Pump
4. Throttle Cable
5. Throttle Body
6. Electronic Control (ECU) Unit [1]

NOTE: The system that could be the source of the symptom are listed and should be checked in order, starting with #1.

[1] See "DIAGNOSIS BY SYMPTOM" under "Computers and Control Systems".