Sadly

my 96 Cherokee is living up to the name First couple times it was a specific fuel injector connector fixed it a couple times got a new pcm worked fine till one day it didn’t was told i needed a new harness due to all the injector wiring being old and lost all the coatings protecting the wires. Finally got time to look at the replacement engine harness i got and it’s a grand Cherokee harness, what’s the best course of action??