Which way are you testing -- the nipple on the vac amplifier or the hose to the tranny?

I'd not actually expect the vac amplifier to hold a vac unless you plug the signal lines to it, it is only modifiying vac from anther source, and one of those is a controlled leak!

The line to the tranny MUST hold vac -- if not, then your shifting problems are partally if not completely a bad line or leaking modulator.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!