I'm still stuck. Tested good vacuum at switchover valve, to the tranny modulator. Put the vacuum gauge on the SOV and pumped up 15hg vacuum and it held. Still, when the car is shut off for over 1/2 hour, it won't shift correctly until i rev it high and shift into third and/or it's up at full operating temperature. Then the shutoff valve slowly works. I've replaced both shut-off lines and the rubber connectors to the key switch. Maybe the key switch is bad?? Also, maybe a slow leak at the break booster line?

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Mike
Vancouver, BC
'79 300td 60k miles!
import from Japan