ok, well my situation is i took my car in cuz the tranny was really noisy, so they got a "new" one and put it in my car. But i dont kno exactly what they had to remove or wut they did to put it in, but im sure they had to take out some stuff from the engine bay. Heres The ProbleM, i noticed that my car idles a little rougher than when i first got my car, and the exhaust has a very distinct smell to it,like almost a sulfer smell. what the heck do u all think might be my problem> no CEL, or anything, Help is very much appreciated, thank u sorry its so long