Well, if it helps, mine does the same thing you describe exactly. I've had it checked and the fluid is fine and there on no leaks of any kind. Mine has done this since I bought it a year ago. I've put 16,000+ miles on it and tracked the car often and had no issues. I was told it was just the more aggressive program of the SRT. It's obviously not all that "refined" like most Benz engines. It's a beast and I guess it's just a side effect of that. I do know that it is directly related to the "throttle by wire". I've been told a Sprint Bosster will solve this issue. I haven't bought one yet, so I can't verify it. I have had some varied success with the throttle reset procedure. I do the reset once a week and it does help, but not completely cure the issue.

Some cars do it, and some don't. That's about all I know. I haven't had any mechanical issues and the car runs as good as it always has... I wouldn't lose any sleep over it. It can be annoying, but I don't think it has any issues associated with this characteristic.