Hello, I am John, a Ford dealer technician.
I hope I can help solve your problem quickly and accruately.
First off a few questions. With the key on and engine off does the check engine light come on? If not check the pcm relay. This is the brown relay on the drivers fender. If the light comes on does it turn off when the engine spins over? If not let me know and we'll go from here.
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mil does come on; forgot to let you know that; dtc's are 21 and 85 ; etc and canisiter purge
correct; sorry on in key on ; off in crank
I'm going to post a wiring diagram for this system for you to reference. You need to test resistance, test resistance to ground and resistance to power. Make sure the battery neg is loose or you will fry your meter. You are going to need to check all the circuits between the pcm, coil and tfi module. Sorry I can't help more, hard to do from the other side of the computer ;)
Click here for diagram