Check Leakage Or Clog Of Air

• Any damage or installation of throttle body gasket.
• Any damage or installation of gasket between intake manifold and surge tank.
• Clog or contamination of intake manifold and injector by foreign materials.
• Contamination and open stuck between surge tank and PCSV by foreign materials.
• Any damage or contamination of HO2S(S1) by foreign materials.

YES 

• Go to "Check Fuel Line" as follows.

NO 

• Repair or replace as necessary and then, go to "Verification of Vehicle Repair " procedure.