just went through you 3 first vids
what you have is exactly what you should expect
it should get progressively worse
that is how a efi will react as it learns wrong, from incorrect info.
having a cold start, hot start, repeated starts.........will ALL be different
I am sure your fuel trims would show this
your setup is so far from stock, and fairly 'butchered' up
that you need to be very competent in diagnosing it
I believe your are in for a real dose of frustration with that thing
fox TB, hot air intake, cut out emission equip, who know what else.......
at this point, get it to operating temp, and check 02 voltages,,,,,,see if it is stuck lean or rich.....
then move from there..
89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.