i posted about my new suburban having a low cylinder a week ago or so. i just went and bought a new 18" open car trailer and on the way home, the truck seemed to be running rougher. now it could have been the trailer pulling against the truck and the trailer was empty, but it seemed like a more pronounced miss. is it possible that this cylinder is farther gone than previously hoped? i also found out that my hitch plug on the back doesnt work properly so i'll have to dig around in there too.