I'm brand new to tuning so I put this post off as long as I could while I tried all the solutions I've found so far. The problem is my LTB2 is in the red at 19.5 most of the time. It comes down when I raise the RPMs but eventually finds its way back to 19.5.
Here's what I've done to troubleshoot. I've chased down and filled any exhaust leaks. I checked for vacuum leaks and did not find any. I pulled and checked all the bank 2 spark plugs and checked for any obvious issues. They looked good and were gapped correctly. I checked all my wires. I swapped the O2 sensors and the problem persisted.
Something that seems odd to me is that LTB2 is pegged at 19.5 before I even start the engine. I tried pulling the negative battery cable for a while thinking maybe it would reset something, but problem persists.
I have a fairly modified 2002 Tahoe with a 5.3. I had a professional tune a year ago. Recently, I did a 4L80e swap and bought HP Tuners to do the segment swap and learn how to tune in general. All seemed to go well with the segment swap, but now that I have HPTuners I noticed the LTB2 situation.