First, do 50/50 test
Spray gasoline or starting fluid into the intake
Crank engine <<<< this is the only way to test for spark and spark timing, spark testers don't work well on Fords Waste Spark system
If it fires up and dies you have spark but no fuel from injectors
If it doesn't fire up then you have no spark
50/50 instant results
Spark system is really simple
On the front of the engine next to crank pulley is the Crank Sensor
It reads what looks like a "gear" on the pulley, this times the spark AND fuel injectors
So computer will only start spark and injectors when this sensor starts to send pulses from crank spinning
Crank engine over and then pull out 1 spark plug, see if its tip is wet, if its wet then crank sensor is working, if its dry AND no spark then could be crank sensor is bad, these rarely fail but rarely is not never
Only thing left for no spark is Coil Pack power, pull off 4 wire connector, test RED wire for 12volts with key ON
If no 12volts then check fuse #19 in cab fuse box, 25amp fuse
Do the dash lights come on with key ON?