those broken tabs can definetly cause you issues. the ficm is made to fit snug and in there. a work around that I have seen is people using zipties around the ficm and the connectors. dont quote me on it but I have seen it and in theory I would think that it would work.Everything is together at this point, and I tried to double check every wiring harness that is visible at this point. However, I can wiggle and check the FICM connectors one more time to be sure. The connectors have broken clips unfortunatly, could those cause it to be loose enough to bring up contribution codes? Also, I have gotten a U0105 "Lost Communication with FICM" once, but the battery voltage was a little below normal at that time. It never came back, so I haven't worried about it too much, but it could possibly indicate an issue. Forscan has a free trial, right?
your voltage seems fine but a little high? I am no expert and I am sure someone will chime in on that. as for the chafing, that needs to be fixed. check the wires for breaks, fray and stiffness. if it looks bad and you can see that it is worn then chances are it could be worn. without seeing what wires your talking about it could be several things. I am thinking that you are just having electrical issues. I personally am dealing with my own crap (pulling engine with just me).Found chafing near front of driver's valve cover, but it looks like it may have been fixed before under air filter. What do you think the truck's lack of boost? Do you think it'll boost once the throttle is fixed and the truck can produce greater exhaust pressure?
