That vac system is a bit complex.

First, you must verify that you have good vac to both the vac line at the shift control valve AND the amplifier. If you have no vac at the vac port on the amplifier, you will have no vac at the modulator, since the amplifer is actually a switching system.

Second, you will probably need to replace all the rubber connectors in the vac system, they will all be soft or hardend and leaking. Solves a number of problems.

Third, verify that the vac valves for the air recirc and EGR vavle aren't leaking -- mine were, so I got terrible hard shifts and funny AC operation, both fixed when I plugged the lines.

On the bowden cable, it must be all the way out with the throttle completely closed, with just enough tension on the cable to keep the spring from rattling. Any tighter, and it will cause trouble. It retracts into the housing as the throttle is opened.

"Hunting" between 3rd and 4th is probably a governor problem in the tranny rather than an adjustment, though.

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!