Now here's my second question... if you plug in the scanne . Read live data and drive around. Nothing pops up with like cylinder 1/3/2/4. Either like spark jumping or fuel pressure dropping or anything that's stands out... I understand you have great pressure and I also know you've been reading the motor with the scanner. I'm just curious what all live data can show while your driving and see what it shows.. may be small but could be a factor.. btw i dont own a fancy scanner that's why I'm asking. Kind of like this. Say it's a spark or volt tiny difference. At least in norrow to electrical. Say its fuel pressure same thing. I just dont know if a scanner can read fuel pressure on each cylinder. Like I said never had a fancy scanner.. I just feel like something dropping for a few minutes hints the misfire. But going up to speed or idling no misfire detected because of the demand... maybe I'm wrong or you covered it already just trying to think as if it was my truck....
It's been a while since I was able to dig back into this, but here's some information for you about scan tools, on these trucks there is no way to read fuel pressure at all without a manual gauge on the fuel inlet test port. Also, there is no way to read fuel injector voltage without a volt meter and back probing the big connector on top of the intake. You can read the ignition voltage at the computer or voltage signals from many sensors, just not injectors. Without connecting the vehicle to a scope (oscilloscope) you won't be able to "see" anything about the spark at individual cylinders.
I am using a Solus hand held scanner and all of the readings seem good, I'm just not very savvy when it comes to performance diagnostics.
I have no codes and going by the missfire counter on the scanner to determine what cylinders are missing and when along with my "assometer".
What I am seeing is missfires coming from the front half of the engine, mostly from #2 and #3.
Since the front 4 cylinders have longer plug wires I assumed that I was getting a weak spark, but I am running out of things to check/replace.