Difficult To Start (Cranks Okay)

Ensure sufficient secondary spark is available.
Check air intake system for restriction.
Ensure vacuum hoses are not disconnected or damaged.
Ensure fuel system pressure is correct.
Ensure fuel injector operation is correct.
Ensure EGR valve operation is correct.
Ensure EGR valve closes completely.
Check for cracks or poor connections at throttle body.
Ensure ignition and valve timing are correct.
Ensure distributor pick-up coil air gap is correct.
Ensure distributor pick-up coil resistance is within specification.
Ensure ignition coil resistance is within specification.
Check coolant temperature sensor operation.
Check control relay operation.
Check power transistor operation.
Check operation of air induction valve.
Ensure electrical harness and connectors are not broken or loose.
Ensure ECU has correct voltage supply and is properly grounded.
Ensure engine has sufficient compression.