Thanks Army, I've eliminated the kickdown, Bowden cable, and vacuum as potential cause. I've read a good bit of the Benzworld post.

All I can figure to do is measure the pressure, everything else is just guessing.

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1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?