Dean, it could be that the ignition control module (mounted on the inside of the left front fender -- has one 8 pin connector, one 3 pin connector and one 1 pin connector, plus a vacuum line) has gone bad. A similar thing happened to our daughter's 1991 300CE last September and had the car towed to the local MB dealer for diagnosis. Fortunately I had another 300CE that I swapped the ignition control module from ... still looking for a salvaged ignition control module for the other 1991 300CE. The module new is $1,500 ... and 2 are backordered for the entire USA. They are extremely difficult to find because so few 104 engines were sold in the USA.

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Fred Hoelzle