Bank 1 fuel mixture is too lean at idle.
SYMPTOMS
- Check-engine light
- Rough idle
- Possible stall
LIKELY CAUSES
- Vacuum/intake leak
- Dirty MAF
- Low fuel pressure
- Dirty injectors
DIAGNOSIS STEPS
- Read idle fuel trims
- Smoke-test the intake
- Check MAF and fuel pressure
RELATED PARTS
- MAF sensor
- Intake gaskets