I have to laugh at this post.

I have been troubleshooting a problem for a new member for almost three weeks and he was determined to find the problem in the vacuum system on an '85 CA 300D. It's a completely different system from all other 123's. So, after we go over it thoroughly, I realize that his problem is not the vacuum system at all.

The damn thing won't upshift.

So, I suggest that he disconnect the kickdown switch and what do you think happens??

He was quite shocked about the whole thing.

Damn switch almost caused another member down in Texas (IIRC) to sell the vehicle.