I had the transmission replaced about 55,000 miles ago and when the
car was in for its last service (355, 000 miles on car) I had them do
the transmmission service as well. When i first got on the freeway i
could feel something strage when under full acceleration it tried to
shift from 3rd to 4th. It was jumpy, like it didn't know if it wanted
to shift or not. I let off a little and it shifted fine. I figured it
was because the transmission was cold so i didn't think much abou tit.
A few weeks later, it started doing it between other gears as well. I
checked the fluid and there was too much. I drained some out to the
proper level but i am still having the trouble that, even if not under
full acceleration, the transmission does not want to go into the next
gear unless i let off a little bit.
In this first pic (i believe is the transmission control valve?), if
i take the bottom hose off, the transmission does not pull as hard and
i still have to lift off to get it to shift, but it does not have that
jumpy feeling.

While looking for a vacuum leak, i came across another problem. Next
to the brake master cylinder is a large vacuum hose and there is a
branch off it (pic 2) that has been plugged. It looks as though the
top of the part in pic 1 haqs been plugged as weel. There are only 2
hoses attached but there are 3 ports. I do not know if these lines are
suppose to be connected to eachother or to other things or what they
even control. I can see no loose hoses that have been plugged that
would attach to either of these locations mentioned.
Any ideas where to look or what to test? Anyone have a vacuum diagram
for a 300SDL?
TIA
 Shannon
86 300sdl 357,000mi
80 450sl   220,000 mi