so i went outside to turn on my music last night and i noticed that the sound is very fuzzy and distorted. its so bad i can barley turn it up and hear any wordds. it just started and not sure what it could be. also when i have my car on the engine will like "jerk" and my lights will dim and the car also jerks with it. its almost like my car is about to stall. my check engine light came on but i went to auto zone cuz they do the free testing and they said it was a gas cap problem so i left it alone. im starting to think there is something else wrong.