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I have a 1999 Ford f 250 super duty with a v10 engine. About a month ago i noticed i had a small crack in one of my headers. I removed the header, took it to a welder and had it welded. I put it back on the truck and when i drove it that day it didnt seem to be running right. It drove like it was cold and needed to be warmed up. It got worse untill i finally took it to advance to hook it up to a computer. The computer said i have a Fuel trim bank two condition (PO174), Catalyst efficiency low-bank 1 (PO420), Cylinder misfire detected- cylinder number 1 (PO301), Cylinder misfire- cylinder number 6 (PO306) and Cylinder misfire number 7. ( Lost the paper with the code). I think its gonna be either a or a few coil packs have gone bad, there is still a crack in the header and its pulling air and trying to correct the air-fuel mixture or its the mass air flow sensor. PLEASE ANY HELP WOULD BE GREAT!!!!!!!!