Engine Cranks but Fails to Start

Ensure proper spark exists from ignition system.
Ensure ignition timing is correct.
Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector, fuel pressure regulator).
Check engine compression, valve clearance, valve timing and timing belt (if equipped).
Check airflow meter or MAP sensor and wiring.
Check idle air control valve (if equipped) and wiring.
Check circuit opening relay and EFI main relay.
Check STA signal at Engine Control Module (ECM).
Check Engine Control Module (ECM) and wiring.