do you have any idea how they identified that manifold leak? i imagine that can't be too common on the m104's. i don't have the surging yet but have had some signs of the throttle actuator going - specifically my cruise control which has a mind of its own(last time i checked it was working). i've also had the cold start hiccup a couple of times and attributed it to "bad gas". this winter i hold the starter until i'm sure it's caught. i've seen how the 93-94 m104's have very similar problems at the same mileage...
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"