During the removal of the old exhasust headers, I accicendlty broke the O2 censor and automatic trans. Cooler line. Replaced the the lines and the radiator and car was running fine at first. I did not replace the O2 Censor, and now the car sputters, engine slowly fails and dies down. Sounds as if it stalling. No smoke but the exhaust smells rich as if it is still burning oil off the exterior.