Very weird ignition problem, running rich? I\'m stumped I just installed my headers on my 92 Yukon today. I ran a set of Pacesetter shorties on it. My exhaust system was rusted off, so I had to yank that, so I'm running open headers till I can get to the muffler shop and have them bend up my duals. I got them all installed and then drove around the block (less than a mile) and when I got home one of the tubes had already blistered, but none of the others. When I revved up the truck, it would backfire from that bank and not the other. I know the wires are right and the plugs are good, I checked them. Anyone have any ideas?