diagnosis

These types of problems are hard to diagnose, you need to determine if the engine is losing ignition spark, fuel pressure or injector operation when it fails. Also, check for diagnostic codes in the engine module, and check for any related technical service bulletins from MB.

same thing happen to me it was the cps. Crankshaft position sensor. Took it to a mechanic had the part replace for 300. Dealership will do it for 800