Intermittent electrical problem

[CNH-320]

I was driving my 2007.5 2500hd 6.0, it’s a non-daily driven truck and it stated bucking when shifting to 3rd gear and 2nd I think. After a while I noticed the tach was at 0 rpm. I got a p0336 and P0011. 

My first thought was the trans was toast because it has a mild 2-3 shift flare and mild delayed engagement into D and R.

I restarted it and the tach started working again, then I ran out of time to diagnose it. Cleared codes and looked through alldata trying to get some ideas. 

A week after all this happened I drove it to work, about 30 minutes, mostly highway. Ran 100%.  When I started it to leave work that day it had the P0011 and b2s1 lean code, p0174 I think. About 10 mins into the drive home it started bucking a little, then more and that’s when the tach dropped to zero, Also zero rpm on the data stream and p0336 set. Also about this time the b2s1 fuel trim went to like steady 28 from being dancing around 0 the whole time. The truck ran kinda bad, bucking on acceleration and shifting until I shut it off to get some lunch.  On the restart, I got the tach back and it ran fine for a bit but then back to the same symptoms till I got home. I drove it the next day into town and back, ran 100%. Seems to only do it when it’s been driven a while.

Does anyone know if this is a common issue with these trucks? I’m not sure where to start on this one. Are there any common places the harness gets worn through or common bad grounds? 

I’m hoping for some good tips as my time is very limited lately due to my newborn. 

I used to be a tech years ago so I have a decent understanding of most problems but I’ve been out of the game since 2009 so I’m a little rusty on diag problems.

Engine has low oil pressure, I’m pretty sure it’s the cam bearings because I’ve replaced almost everything else, including the vvt cam sprocket thing and the cam bolt (vvt valve), torque to spec.  I just changed the oil, I switched to Mobil 1 5w40 with a qt of Lucas.

I undercoated with nhou last summer.  It’s also my plow truck but doesn’t see much use anymore.

 

Thanks for your time,