Hard To Start (Long Cranking, Erratic Cranking Or Erratic Starting)

Check for battery or starter malfunction
Check for Camshaft Position (CMP) sensor malfunction.
Check for Crankshaft Position (CKP) sensor malfunction.
Check for damaged sensor ring on crankshaft pulley.
Check for EGR system malfunction.
Check for fuel pressure regulator malfunction.
Check for fuel pump malfunction.
Check for Idle Air Control (IAC) valve malfunction.
Check for incorrect gap between CKP sensor and crankshaft pulley.
Check for intake air system leak.
Check for Mass Airflow (MAF) sensor circuit malfunction.
Check for open in START signal circuit (Millenia).
Check for operation of immobilizer system.
Check for PCV valve malfunction.
Check for poor fuel quality.
Check for Pressure Regulator Control (PRC) system malfunction.
Check for purge solenoid valve malfunction.
Check for restricted air filter.
Check for restricted exhaust system.
Check for restricted fuel filter or fuel inlet sock.
Check for restricted or plugged fuel lines.
Check for spark plug malfunction.
Check for spark plug wire malfunction.
Check for vacuum leak.
Check for Variable Valve Timing (VVT) system malfunction (Miata 1.8L).