I have replaced my modulator and had the transmission adjusted through the port on the side of the tranny. It was very close to specs and it shifted pretty well. That was a month ago and now again the car shifts like its getting kicked in the rear by a donkey. This is a 1995 E300D. I like tinkering on my Benz;s but this is getting ridiculous. I checked the lines and all seem to be on and tight. I put a mityvac on the modulator and pumped it up to 20 and very slowly it leaked down(I think it was because I did not have the right adapter to grip the modulator input.

Any advice pleaseeeeee

BTW can too much tranny fluid cause hard shifts? Just wondering. My tranny filter and fluid was changed a few months ago.