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Got your message, I'll dwell on it. "Dead Throttle" issue sure sounds like the actuator to me too, but if anything the mileage would be GREAT because the throttle won't open fully, or course this is only intermittent. Wouldn't cause a fuel smell.
Check type of sparkplug, make sure they are the correct Bosch plug MB specs for the engine.
Popping/backfiring makes me wonder about the cam advance system, this would most likely be a mechanical fault, not electrical since you say the harness has been replaced. I'd definitely check out the possiblity of an electrcal fault, simple as disconnecting the solenoid and trying to start it.
For fuel injector leak, just check the condition of the plugs!
What does the MB Dr say about the codes? Would seem this should be the first step. Unless all this work wasn't initiated by the MB Dr, I'd say you need "a second opinion" because he is shotgunning this problem to death. If the guy doesn't know what to do, he shouldn't do anything. Sounds like a supreme parts replacer.
Gilly
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