Wierd starting problem with me 98 E320. About 25% of the time when I start the car it will fire and turn right off. Sometimes it will do this 2-3 times in a row. But, when it starts it is fine. Has anyone heard of this issue, no "check engine" light. It seems to do it more when the engine is cold than on a warm start. It is a bladeless key car.

Also, there is a low level hum from the engine when accelerating at low rpms. Whats that about? Is that normal?

Thanks

77 450sel-162,000 mi
95 E320 wagon-123,000 mi
98 E320 sedan- 110,000 mi