Difficult To Start/No Start (Cranks Okay)

Check idle speed control servo (if applicable).
Check stepper motor (if applicable).
Check ignition switch.
Check TDC sensor.
Check crank angle sensor.
Check inhibitor switch (A/T).
Check airflow sensor.
Check coolant temperature sensor.
Check idle position switch.
Check power supply to ECU ground.
Check fuel pressure.
Check for disconnected or damaged vacuum hoses.
Check for control relay malfunction.
Check for PFI system malfunction.
Check for fuel pump drive control system malfunction.
Check for ignition coil malfunction.
Check for ignition timing malfunction.
Check for power transistor malfunction.
Check for fuel injector malfunction.
Check for ECU malfunction.
Ensure electrical harness, connectors and wires are not broken or loose.