Will Not Start (Cranks Okay): Spark

Check ignition fuse (if equipped).
Check fuel system fuse and fuel pump relay.
Verify air intake system is unrestricted.
Ensure fuel system pressure and volume are correct.
Check cold start valve operation (engine cold).
Check thermo time switch operation (engine cold).
Check for poor quality or contaminated fuel.
Check condensation (water) in fuel tank causing fuel pump to freeze (cold climate).
Check exhaust system for restriction.