My mechanic has moved coil packs to different cylinders ,replaced spark plugs and crank sensor.The truck seems to run just fine but after 4 miles down the road the check engine light comes back on for the exact same cylinders.Spark plug wires have also been changed.
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A quick way to check the single coil pack if you know for sure which cylinder is miss firing and its setting a code you can swap the coil pack to another cylinder and see if the miss changes from one cylinder to another. If it travels to where you moved the coil then the coil is bad,if not you have other problems.
Since the 5.9 engine uses one coil and a distributor, I will assume you have the 4.7 engine with coil on plug ignition. The easiest way to test the coil is to move it to a different cylinder and see if the miss moves with it. Problem could be an injector or something mechanical too.
Try moving the coil pack from cylinder 1 to another cylinder (swap locations) and see if the same code comes up. If code is different, then coil pack is bad. Other reasons for miss; bad injector, poor compression. Also, I know you changed plugs already, but always use AC Delco 43-103 plugs on this vehicle.
if this truck has an o2 sensor i would replace that and also make sure the cat-converter is not plugged,this would give you your powerloss and egr code,next is your coil,this may be caused by the computer or your crank sensor,look at the tone ring that the crank sensor uses and make sure its not missing teeth or broken,also check all your fuses.
The cylinders are numbered as on the spark pack you changed. You might have done better putting the seafoam in the tank as an injector cleaner. Not sure why you changed so many parts, you seem to know how to get the codes from test connector lead hookup and the blink pattern. You might also want to check the fuel rail pressure and the crank and cam angle sensors. Before replacing the injector, swap the #4 injector with the adjacent one and see it the code moves with the injector or stays put. If the code stays on #4, then check the injector wiring, if it moves clean or replace the injector.