Fuel Injected Models

Use sound amplification tool to verify fuel injector(s) working noise.
Ensure fuel system pressure is correct.
Verify ignition timing is correct.
Check PCV system for restrictions.
Check airflow meter.
Check coolant thermosensor for correct resistance.
Check air valve or ISC valve for malfunction.
Check for cracks or poor connections at airflow meter or throttle body.
Check O2 sensor for fluctuating 0 to 1.0-volt output while increasing and decreasing engine RPM.
Verify throttle position sensor has correct adjustment and resistance value.
Check for purge valve malfunction.