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Boy, that's a weird critter.
My 4.7L has a common injector power wire fed from the ASD relay, and separate ground wires that are switched by the PCM. I might come up with something along these lines, because my truck will randomly go into DFCO You know, like it'll actually go into DFCO at a certain spot and a certain speed at a certain time of day, and on the next day it'll just laugh at me and continue to run at about 13.1 AFR at that same spot and that same speed at that same time of day.
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