Thought I had my problems solved. I have an 85' 300sd that had a bad vacuum pump. The car also runs really rough in third and forth gear. Has no power going up hills. Acts as if it is starving for air and or fuel. Also, the car will still not turn off. Replaced vacuum pump and it is now pulling 15" instead of 1"Hg. It runs fairly well in first and second gear provided its not going uphill. Any clues??? I sure don't.