So I was driving my lancer and it has been hesitant on acceleration for a while and check engine light would come on and off, but now the car all of sudden started to be cluncky while driving and check engine light came on again. I called the dealership and asked what it could be since it got recently serviced by them. They said they got a code that it could be catalytic converter while it was over at the dealership. How do I know if it’s really the catalytic converter or if my transmission is out. The car barely drives don’t really hear a sound either