i have a 1987 260e. i used to run my car with 5 dollars of gas at a time. deffinately wasnt the smartest thing to do. but i ran it out of gas and now the car runs very rough. especially on hills and accelerating from a stop. i changed the fuel filter but it still does it. i think it is a problem with the catalytic converter. The converter turns red hot when i let the car idle for a few minutes. i had problems with my exhaust even before i ran out of gas. i think i need to replace the entire exhaust system. if anybody knows of a good place to get a new exhaust system please let me know.