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Hello, my name is***** and thanks for your question.
When the problem is occurring and timing advance at zero, what are the two knock sensors reading?
Is there any engine noise at any time? Ticking, knocking, spark knock?
You would read it just like the timing advance pid. Pids would be labeled KS1 KS2
Load and throttle pids good readings on acell, even light acell. Most timing lack of advance concerns are caused by the PCM retarding timing due to high knock sensor counts, which is usually caused by engine noise, exhaust leaks,loose spark plugs, valve train noise,spark knock etc...
Kind of strange you can read all those pids but not knock sensor
Can you take a picture of the pid selection menu and attach it here? Might be called something else. I am only familiar with Ford IDS scanner.
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Sometimes you can reset kam on the road, and the PCM will ignore the knock sensors for a brief period of time. Best performed on a quiet road where you can pull over. To reset kam disconnect both battery terminals and touch together for 5 seconds then reattach. Drive truck and see if power is restored. It doesn't always work so you might try it several times.
If power comes back then you know the PCM is seeing too much engine noise and causing the lack of advance. Then you can concentrate your efforts on trying to find any unusual engine noise that the knock sensors are detecting.