6. Check Intake System For Leakage

1. Check entire air intake system for leaks or blockages such as:
   • Throttle body
   • PCV valve
   • Intake manifold
   • Gasket between intake manifold and surge tank
   • Seals between intake manifold and fuel injectors
   • Seal between surge tank and PCV pipe

Is entire air intake system good? 

Yes: Go to next step.

No: Repair or replace it.