wierd dropping cylinder problem...cyl number 4

[alright2020]

so last time the problem was in cyl number 6 and it ended up being a grounded wire in the wiring harness...so i am thinking this may be a similar problem with possibly a faulty wiring harness....

when the motor is at normal operating temp it will start to drop the cyl then it will come back then itll finally drop it for good. until the car cools down. i have extremely powerful electrtic fans and with the weather outside i can make my car stay cold and when i do this it stays on all 6... thats what confuses me about the wiring harness...

with the last problem i swapped out the injectors cause i had an extra set and though it could have been the issue...could one of those injectors failed now and made this problem? or does it sound liek something else?

the last time i finnaly jsut had a shop do it because i really couldnt find the issue and it took them 4 hours to find the probelm that turned out to be a wire..

ideas guys?