Two days ago my battery was dead and we had to jump start my car. The next day we noticed the Check engine light had come on. Yesterday we drove twenty miles and when we stopped at the stop light the car died. It sputtered and smelled like sulphur when we tried to start it. After about 5 minutes it finally started but was running really rough and trying to die. We managed to get it back home but have no idea where to even start.