I am no expert so take what I say with a grain of salt, but when was the last time you changed the fluid and the filter? MB trannies are notorious for acting up if not given its regular service on schedule!!! Does the tranny have fluid? You do not have a fluid leak?

I would start off with this and see what happens? Also, are all the connections hooked up? I believe that the car should have a vacuum line to the tranny, is this still hooked up no craks or leaks? How is the engine running?

Iggy

__________________
Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)