Another update to my situation, I’ve gotten the truck back from the dealership. I put a pause on flushing the fuel system for $1200. Technician said the fuel was a little cloudier than he would’ve liked to have seen and after leaving the fuel sample out over night he saw some bubbles sitting at the bottom of the sample. Just as well, looks like he was reading some misfires upon deceleration with all 6 cylinders when he test drove it besides the original code for misfires on start up of cylinders 3, 5, and a random misfire. I’m just going to cycle a couple of good tanks of fuel through and if the check engine light doesn’t come back I guess I’ll be good. If it does come back, I’ll be taking it back to the dealer to see what’s going on next.