have not been back since 6-2-18.....i would not have guessed it had been that long...
busy...too busy.
what year 351? what system efi? power goals?
it seems you figured out the eec pc codes....if that is what you are using.
i would assume your using eec4, but for all i know you have a lightening setup which is unique.
the eec4 is essentially a 1 wire hookup if everything is remaining stock to get it running, which you have obviously figured out..
eec5 is a bit more work but offers a huge range of tuning.
using a hybrid intake system? or stock truck?
stock injectors? stock rail and fuel pressure regulator?
what fuel pump? clean power to fuel pump?
what manifolds/headers did you use?
o2 sensor/sensors correctly mounted? this can cause odd issues. when not running cats, and a bigger set of pipes i have found i need to put it a bit closer to the fire or theres fuel trim issues.. and o2 heater circuit functioning.....the older harnesses sometimes are fuse linked and once shorted out the heater circuit dont work...
if you know for sure the engine ran flawlessly before the swap, its possible debris got into the fuel system and maybe some intectors are fouled as well. dont get me wronk, may just be a few boogered plugs from the initial fire up process...
but
i flush the fuel systems now before fire ups with no injectors in place and if i have any doubts, i have used injectors cleaned and flowed these days. i have had ridiculous tuning issues in the past having used all new injectors and fuel systems, then once on dyno finding the fueling anomalies, so based on that putting another set of new injectors in and all is well....thinking at first i got brand new shitty injectors(which does happen quite a bit too)....then finding out i was the dumb fawk that probably fouled the new injectors by not following proper flushing ettiquette...
well......you will have that.
so dont be like me
the wiring is dependent on needs/goals and actual systems employed.