I'm curious about your comment about replacing the A/C component behind the glove box and relating it to the engine idle issue...
Are you talking about the Valve Block? It has about 15 vacuum hoses on it...
How did you trace the problem to the valve block.? Was it a vacuum leak?

I'm curious cuz the climate control on my W140 does strange things now and then and my idle occassionally wanders... have checked various components of the climate control system and am left with the valve block as a possible problem area... never thought about the two being related.

Can you fill me in on how and why you thought yours was bad?

Thanks, KenP