Possible Causes

Possible causes are:

• CKP sensor malfunction
• Camshaft Position (CMP) sensor malfunction
• EGR valve malfunction
• Excess air suction in intake air system (between Mass Airflow/Intake Air Temperature (MAF/IAT) sensor and intake manifold)
• Fuel filter clogged
• Fuel leakage in fuel line
• Fuel line clogged
• Fuel pump malfunction
• Fuel pressure regulator malfunction
• Fuel runout
• High-tension lead malfunction
• Ignition coil malfunction
• Insufficient compression
• MAF/IAT sensor contamination
• PCV valve malfunction
• Poor quality fuel
• Purge control solenoid valve malfunction
• Related connector and terminal malfunction
• Related wiring harness malfunction
• Vacuum hoses damaged or improper connection
• Variable Valve Timing (VVT) control system improper operation