i just had this issue the other day but i also had a p0200 along with it. i hooked up my scanner and could see that #8 had a TON of misfire counts. if you have a scanner with that capability, it will help narrow it down to which cylinders (on top of what you found). then i went to autozone and rented their noid light kit and sure enough, #8 injector plug was not getting power from pcm. so i would recomend the noid light to make sure you are getting power (both positive and negative) to the injectors. an easy thing to check is spark by pullling the plug and grounding it. make sure you got spark. also see if they are fouled to see if you have a deeper issue. if your getting spark then you know your coil packs are good. just start from the end and work your way back.

the solution to mine was simple and wont help you any but ill share anyway since you said nobody else shares the answers. lol i have bigger injectors so i have plug adapters. one of the pins in the adapter wasnt clipped all the way in when it was made so it pushed itself back out causing the injector to only have the positive 12v and no signal from the pcm controlling it. pushed the pin back in until it clicked and she been workin just fine since. might be something as simple as that for you too.

p.s. you might have a short between the injector wires in the harness causing the injector(s) to stay on or off at all times. might have to start tracing wires out. good luck