Peterbilt 379 Missing and shaky idle

Hello. I am new to this forum and I apologize if I posted in the wrong section. I usually read a lot on here but I can’t seem to find anyone who has the same problem. I have a 2007 Peterbilt 379 with a c15 Acert nxs and I have a shake at idle and a miss at around 1300+ rpm. The miss sounds like a fuel knock and it’s really loud and bad when I’m loaded but softer and quieter when I’m empty. Fuel pressure is good, it doesn’t smoke, no code, and passes a cut out test. Has minimal blow by and uses about a gallon of oil between 10k oil changes and doesn’t use any coolant. Does anyone have any ideas? I’m at a loss and new in the business so funds are low to send it in and have it really torn into

 

Yes we did and no real change between cylinders

 

My mechanic wants to pull all of the injectors and check the O-rings use a camera to check the cylinders and do a compression test. Have you used aftermarket injectors before? I was thinking about buying a set of six and having him put them in because cat wants 860 each

 

Ok thank you. I’m going to try new injectors hopefully that fixes it

 

I bought the truck 8 months ago with 400k on an inframe. How did you figure out that was your problem?