Bringing this back to the top...
Life has been good since the #8 injector replacement. Yesterday, I returned my PCM tune to stock to get some info, then re-loaded the 40HP Tow tune. I drove to my daughter's basketball game and on the way home, I was sitting at a stop light and got a 1 second surge "WHOMP" like I had pressed the accelerator, but my foot was on the brake. Hmmmm...that was odd. By the time I got home, it was idling weird and erratic like the video I posted earlier in this thread. Sounded just like this video (not mine - just the best video I could find to replicate the idle I had):
6.0 ipr issue - YouTube
The last time it did this when this whole thing started, I had just loaded the same PCM tune for the first time that morning, and the issue started happening that afternoon/evening. Knowing that, when the issue started up again yesterday, I was thinking that it was possibly a tuning issue with that tube, so I returned the PCM back to stock and test drove it - it was still doing it. I also returned my FICM back to stock (was on Atlas 40) to rule that out, and it still did it with the truck PCM & FICM tune stock as well. When it acts up, FICM MPower, VPower, and LPower are all good as well as FICM sync & Cam/Crank sync, so i'm thinking it's not the FICM (still not totally ruling it out though).
My thoughts are:
ICP sensor/pigtail - which has been changed in the last year
IPR valve/pigtail - i'm gonna poke around today and see if I can get it to act up
FICM - Not sure on this one
Injector - again...gotta get it to act up to rule this out!
I spent 2 hours driving around last night looking at my monitor and NEVER COULD get the truck to act up again! Did I mention that I HATE intermittent issues...?
I REALLY thinking about swapping out the IPR. I found a lot of threads with similar idles as mine, and the IPR swap fixed theirs, but I HATE throwing parts at the wall hoping it sticks...