on my 82 chevy dually 454 last few days its been below zero truck has been ideling roughly and during first exceleration it seems to be sputtering like theres a bad miss. hard to excelerate for about 5 or 10 seconds then it gets up n goes fine. i had blown out one muffler on dual exhaust (getting new ones tomorrow). is it bad? may be a head gasket? or maybe fouled out plugs? thanks.
