From the description I would think one of two things. The first is that the misfires loaded the exhaust with raw fuel. That could cause the rough running as it's trying to burn that off and causing the fuel mix to go crazy as it tries. Second would be if the raw fuel overheated the catalytic converter enough that it fused the substrate and it's blocking the exhaust flow, that would cause rough running and the smell.
As a test I would remove the front O2 sensors and start it, if it runs better then you will need to check the exhaust system for blockage.
This shows a few tests that could help:
https://www.2carpros.com/articles/how-to-test-a-catalytic-converter
Does it also have white smoke out of the tailpipe? Or if you hold your hand over the exhaust is any coming out?
The sensors can be different on that truck depending on which emissions system it has. The federal version has 2 sensors while the California version has 4, the ones to remove will be the first ones in the pipes coming from the exhaust manifolds. Those are also the ones you test in.
Image (Click to make bigger)
SPONSORED LINKS
Monday, April 12th, 2021 AT 5:32 PM