Some crackhead tried stealing the battery from my 1997 850 (unsuccessfully). Got under the car and evidently pulled several vacuum hoses off. Where can I get a diagram of the vacuum system? The car is running rough at lower RPMs when I put it in gear and RPMs drop quickly when I take my foot off the gas. Thanks!

 

There may be one stuck to under side of the hood. You can also check the engine bay or do a search.

 

One of my biggest frustrations has been trying to find vacuum diagrams due to the numerous variations to the 850 engines. Here are some that I have found so far.

Volvo 850 Non-Turbo - lots of good pictures:
http://www.matthewsvolvosite.com/for...iagram#p189202

This one is a .pdf page from a repair manual for an 850 non-turbo:
http://www.volvoclub.org.uk/tech/ser...umDiagrams.pdf

Here is a .pdf for a 850 Turbo:
http://www.volvoclub.org.uk/tech/service/850/VacuumDiagrams-Turbo.pdf

I know there are more out there; however these are the only ones I bookmarked. Hope this helps!