Injector noise with codes
I have a 99 F350 with 180K miles. Recently there is a sound when it is cold and less so when it warm. It sounds like one louder injector or an exhaust leak. I did the buzz test with AE and all 8 buzzed loudly with #8 being louder than the others by a little bit. I also replaced the CPS with a gray one and then a black one from IH. No change. I am getting a cylinder balanced codes on #3 and #8. I run the DP Tuner 3 position switch with a 4" exhaust and an AirRaid intake.
I am looking for next steps to test to make sure this is the problem. I think it has a couple bad injectors, but if I have to open both banks, I might as well do all of them. How long would it take to change all 8 injectors? I am thinking Pensacola Diesel as they have a kit with the valve cover and new wiring harness and reman injectors with glow plugs for $1100. Thoughts?
Thanks in advance.