My 90 300CE has 58,560 miles on it. The first 56,000 were put on in the first 7 years; since then it has been garaged and only 2500 miles have been put on it. Recently it has a habit of stalling or not starting, very intermittent at first, more frequent recently. Tests today revealed 12 volt power going to the MAS but no power coming out of the MAS to the fuel pumps. Is it possible the MAS itself just went bad (from non use or aging) or could some other item (O2 sensor, ICV, etc) be giving it a bad reading thereby causing it to not activate the fuel pumps?