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Transmission vacuum shifting valve keeps dying

I've got a 81 300D. The transmission vacuum shifting valve went bad & it started shifting hard & going back & forth between gears. I replaced it with a good valve off my 'spare parts' car. The transmission started shifting like perfect again. However, after maybe a month the car is shifting hard again. I suspect something on the car is killing this valve.

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W123

starting problems

I ahve recently been given a 1980 300d gold wagon, it is not running, why? ...I have replaced fuel filters except for the tank one also return lines, glow plugs, glow plug relay did a valve ajustment replaced battery... the motor cranks over and seems like it wants to catch but nothing what could this be ?// any ideas would be alot of help

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1985 300D Won't start/ power loss/ hard brakes

SUBMITTED NOV 19, 2007 I bought my 1985 300D back in 2004 and it has been a good, reliable daily driver. I put her in storage from Jan-Oct 2007 while I was in Alaska (on an island). Since my return, I have made a 2200 mile move and have been plagued with problems. I did put fuel stabilizer in the tank before I left, it was only 1/4 full. 1. Loss of power on highway? Fuel filter/injectors? Brief History: Car historically ran 75-80mph highway with no problems. Upon my return and a fine start, 176 miles into trip noticed a feeling of 'bogging down' like running thru mud. Could not get above 63mph, no matter what.

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My '81 240D stalled, and now won't restart..

Okay..

I rolled my '81 240D off the ramps, after changing the rear
diff fluid (boy-- I bet THAT stuff was there since the Reagan
Administration!)..

It stalled when it came off the ramps, and refuses to restart..

IN THE LAST WEEK-- I replaced the passenger rear window (as some
vandal put a rock thru it!). Also last week, I changed the
transmission fluid (including draining the TC) and put up a new filter..

I also put up a new starter-- because the old one wasn't always
engaging.. (New one works fine, and I had it bench tested BEFORE I put it up)

Anyway--

The car has historically HAD a vac leak-- to shut it off, you turned
the key, and locked the driver's door, and it would stumble out.. The

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