How's about telling us how many miles on the baby. Do you have the service records? Have the plugs been replaced? Distributor rotor and cap? What else has been done?

At about 175K my 1992 300E suddenly crapped out at a stop light 200 miles away from home in a rainstorm on a Sunday afternoon. Had it towed to a local MB Indy. He went through everything . We did EHA, Coil, OVP relay,
Plug Wires, O2 Sensor, and a few more things I don't remember. Granted I told him to make it right. $2500 worth of right. My point is that I wouldn't have stood a chance of getting it right.

Your situation may be different, but it's hard to guess when you provide almost no information .

Steve