Help me chase a misfire code please...long post

So let me start by saying this is a 2003 C2 Cab, and apologize for the LONG post. Stock motor, with new LN IMS bearing about 2 yrs ago. Presently at 130,000 kms (~80K miles). So last week I took the car on a couple of long business trips. First 500 mile run, flawless. Second day it was drizzling but warm. About 300 miles into the trip, on cruise, steady throttle, I was almost at my first stop, when I felt a stutter, then smoothed out, then stutter, then CEL light flicked on and flashed once or twice, then went out. Intermittent misfire for the next minute or two, then I stopped and shut car off for maybe 30 mins to make my meeting. Came out, started up, no CEL, no misfire. Ran normal. When I got to the hotel for the night, I did a quick scan with my phone app. 5 pending codes: P1341 Manufacturer defined, P0300 Random/multiple cylinder misfire, P0304 Misfire Cylinder 4, P0305 Misfire Cylinder 5, P0306 Misfire Cylinder 6 Monitored carefully on the drive home, but no misfires, no codes, all smooth. Fast forward to the weekend. After finally getting my UAOS installed (thanks Doc!), and pulled both the cam position sensor plugs and cleaned with Detoxit. After sitting for several hours, I started the car up in the garage. Felt a little rough, then a CEL (solid, not flashing). Pulled codes from phone app again. 1 confirmed, 3 pending: P0300 - confirmed P1341 - pending P0302 - misfire cylinder 2 P0303 - misfire cylinder 3...seems the issue moved to the other side of the car. Back to the computer to do some research on these codes. Much seem to point to vario-cam actuator slow or failure (but I could find no info on Vario-cam Plus, which mine is). It was late so I left it to work at it when I got home tonight. So, tonight I break out the Durametric, and run a diagnostic. scan with engine off I then started the engine and took some active readings of cam deviation, below: Before clearing codes I then cleared the codes with Durametric, started engine and got these readings: After clearing codes. The deviation numbers stayed rock solid when revs applied. I also ran the Ready Status and got this: Not sure if this is related or not, but not sure why these all show as “fail”? I’m a complete dummy with regards to all this stuff, but trying to learn. I “thought” clearing a code, simply meant clearing the memory, but can a fault code effect operation? I may be WAY off, and likely am, but the intermittent nature makes me think it’s an an electrical thing, like a cam position sensor, but moving from one bank to the other, makes me wonder. Maybe crank position sensor giving a bad signal? I would “think” (and as my knowledge is so limited, I’m likely wrong) that something mechanical (like a tensioner pad) would be more consistent?? Any suggestions from the collective?

Quotes source post: 16878968

When I see a 1341 code With a 3 chain engine, the first thing I do is change the oil. You can�t put stock in the misfires. When the engine starts running rough you�ll register phantom misfires from cylinders that don�t have an issue. Your cam timing is all over the place, which can cause the misfires.. Vane cell adjusters that are seeing dirty oil can cause this, and so can low oil pressure. Check the oil pressure bypass valve for a broken/ weak spring.

The last pic is basically showing the rediness of the monitored systems. Since u reset the ecu not of the monitors have been set, u need drive cycles to get them to process. No need to worry about them. also follow jakes advise, he knows these engines

Thanks so much! I am coming due for an oil change, so will get on that right away. I change at 5000 kms (3000 miles) usually, and have UOA done. I was planning to change over to Motul this change. Should I stick with the same oil that’s in it for consistency and lack of adding variables, or does it even matter? I actually changed my oil pressure bypass piston and spring back three years ago (30,000 kms ago), as a precautionary measure (updated piston), but I will check again. Just as a reference, and I know the dash gauge is sketchy, but I saw no unusual oil pressure readings. I watch it like a hawk out of paranoia. I believe Durametric gives oil pressure, so may also try a drive with it hooked up to verify. I am surprised that clearing the codes would result in the cam deviation changing so radically. Does the code cause the computer to compensate, then once cleared, go back to normal running? Sorry for the dumb question, I’m trying to better understand how these things work. Thanks again!

Well, fresh oil change, new filter and codes cleared. All seems to be working fine. I’m going to do another smoke test tomorrow, as I suspect I have another vacuum leak. I changed a leaky manifold adaptor (brake booster), but didn’t have a replacement o-ring (picked up today). Oil filter was spotless, so that was a nice find. I’ve never experienced an engine that would misfire due to dirty oil (with only just over 5000 kms on it), but this thing continues to amaze me on many levels.