Cummins Misfire!!
 

Ive got a 98.5 and a couple of months ago I noticed that when I shut the A/C off that number 1 cylinder starts to miss. There is no fuel getting sent to the injector. I cracked the lines going to the injectors on the head and all but number 1 had a decent quantity of fuel going to it. I then turn the A/C back on in the cab and the cylinder then has fuel. It only does it after the truck has warmed up and been running for a while. Ive put a different PCM in it and no change. I changed the APPS and it didnt change either. I added a different ground wire to the A/C compressor and PCM and it didnt do anything. Ive replaced the APPS 2 times before this started. I think its related to the misfire. Im at a lose, any help would be great