you don't want to hear this but I had the same problem (not going past 2nd) and chased the vacum all over the place and found nothing, I wound up getting a rebuilt intalled at Aamaco for 3K and just moved on down the road. Ok I should add that the car was free to me so I figured this was what the cost of the car was gunna be to me.
There is no such thing as a free lunch

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I would'nt say I've been missing work...

1982 300D Turbo Diesel