94 e320 mystery behavior

[pfitz]

Own a 94 e320 w\96,000 mi. Best way i can describe the behavior, it acts like a fuel vapor lock condition.
Car starts and runs like a champ cold and hot most times. Sometimes after driving will not start, cranks without action. Try, try, and try again, then suddenly starts and runs like nothing ever happened.
Engine harness has been replaced along with ignition components.

I don't have a technichian manual so looking for help from experienced others.