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The problem ended up being the upstream driver side o2 sensor, bank 1 sensor 1. 8 hours into my 12 hour drive today the codes finally popped for it. P0300, P0130, and P0133. Stopped at an advance and got a brand new Denso, changed it in the parking lot. Truck drove perfectly for the last 4 hours...

I did that about a month ago and it got quieter but the manifold gaskets were definitely leaking still, then I did the headers

It had the original exhaust manifolds on it Replaced them because they were leaking

These are the headers I got I will clean the maf today and see if anything changes My codes reader is the $30 one from Walmart so I can see the live data on fuel trims IAT and pounds of air consumed etc but there’s no graphs or way to save it

I replaced them because a few were cracked down the seam and you could see the insides. I saved 1 good looking one as a spare The CEL for misfire was on for about 15 seconds on the hill before it went away