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Did you put a factory Hall sensor and ignition module on the truck?
Code 14 is only caused by a bad signal from the distributor. Either a bad ignition module or stator (the hall sensor) or the wiring from the dist to the computer (that is really rare).
Let's just say that my experience (and that of most Dealership Technicians) has not proved to be very positive with aftermarket components, especially electronic components. The difference between the Factory parts and the aftermarket parts might not be just quality, but the correctness of the component. Where Ford might have 10 different part numbers for either the ignition module or the stator, the aftermarket will have 2. The difference can be something small, but if there is a difference, you will notice it in performance. And that is reguardless of the year.
However, there is another problem with the computers, in that they are no longer available from Ford. The only answer if a rebuilt pcm. And even then I have found it to be a crap shoot.
The next test would be for a pulsating signal at the coil. Just using a test light, first unplug the coil and check which side is power with the key on. Then plug the connector back into the coil and using the test light on the other side, crank the engine over and see if you have a pulsating light. If you do then the Primary side is good (the stator and module) and you have a bad coil. If you don't then the primary side is bad. Time to get the distributor warrantied and replaced.
Yeah, even though the parts at a dealership are more expensive, if they last 100k miles then they are worth it. Glad I was able to head you in the right direction.