2001 Cobra won't pass emissions, throwing codes. Hi, my fiance and I just purchased an 01 cobra with 29 thousand miles on it. We live in an emissions state the car won't pass emissions. They have put a new exhaust on it, replaced the 02 sensors, replaced the fuel njectors, and have tried re tuning it back to factory. The car used to have nitrous on it. What else could be wrong with the car to make it not pass emissions? They told us it is running rich. whatever that means. Thank you in advance for the responses.