I admit the symptoms he states seem to indicate the problem you describe. However hot soak (if that is even the condition he is describing) can also cause crank sensors, coils, modules etc to go bad as well. I do not like to throw out suggestions until I feel I clearly understand the specifics of the problem (usually...)....

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

I have a 420sel that has the center valve leaking but that just blows black for a second till it clears out then runs fine, but the baby benz turns over trys to start and stalls, the next attempt to start it, it just cranks till it gets the fuel and slowly comes to life, I dont know what service was performed on the car my sister inlaw did not say.

I have tried to turn on the key and just let it set for half a min. or so and some times it starts, but not that frequently. I am thinking of looking at the EHA to see what the readings are, the car runs fine and gets 23 city, we use it much more than the big benz, I just wish it had the same ride, but we keep the big dawg for the longer trips.

Well it's a hot soak problem of some kind. If you doubt that then next time it is fully warmed up, park it with the hood up. When you go to start it it will start fine because the heat didn't build up. That will prove it is hot soak. As far as the other symptoms it does sound like the boiling fuel problem that was stated previously. My Supra had the same problem. Basically there was a window between 20 min and 40 min when it would be hard to start. Luckily I usually was parked either less or more than that, or not fully warmed up. I would think other people with the same car would report the same symptom though.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra