ok... i have a 97 civic dx, i just got a dc sports header for an ex, i only have one o2 bung so i only have one o2 sensor hooked up, cuz the other one striped the threads when i took it out. now my car has this horrible shake, and it dies when ever i come to a stop or turn a corner.. unless i keep the engine revd up? so whats arong and what can i do.. also there a horrible smell now... i know its an exhaust leak, cuz i can find a nut that will fit. and a exhaust manifold bolt for it. cuz i had to burn one off the stock manifold, cuz they make everything to tight.