• Engine receiving either too little air or too much fuel

Possible Symptoms:

  • The engine may be hard starting

  • Engine runs rough

  • Failure to shift up or down

  • Transmission may shift harshly

Possible Causes:

  • Intake air leaks

  • Faulty front heated oxygen sensor

  • Ignition misfiring

  • Faulty fuel injectors

  • Exhaust gas leaks

  • Incorrect fuel pressure

  • Lack of fuel

  • Faulty Mass Air Flow (MAF) sensor

  • Incorrect Positive Crankcase Ventilation (PCV) hose connection

Related Parts:

  • Fuel Injection System: Fuel injection system controls the amount of fuel to be delivered through the fuel injectors. Problems lead to engine misfire, engine stalling

Possible Solutions:

  • Check MAF and vacuum leaks

  • Inspect the quality and clarity of the gasoline