About a week ago. I started noticing that my jeep. Misfiring, so I did a tuneup and oil change After doing the tuneup. I got a check engine with the code below. That were for injector.#3,5 and 6 don’t know why but maybe that was why it was misfiring. I checked the harness and yes, there were some crispy wires. I decided to get a used engine wire harness, thinking that the problem will be solved and it wasn’t. I checked the continuity from the plug to the plug on the PCM and it was good. I don’t know if I should just get a new PCM or what should I do

help please