My 1990 300CE has 58,650 miles on it; it ran perfectly for 56,000 miles; I then garaged it for the last several years only putting another 2,500 miles on it. It now has a problem of intermittent stalling or not starting. Tests today revealed power going to the MAS but not coming from the MAS to the fuel pumps. Would this indicate a bad MAS or can some other item (Oxy sensor, ICV, etc.) be giving the MAS improper reading?