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Does it look like this?
http://img.photobucket.com/albums/0803/eroman/HPIM0739.jpg
Under the cover you'll find the throttle bellcrank and linkage as well as the vacuum tree and also the idle air control motor. On my '95 850 Turbo the hose between the IAC motor and the throttle body had rotted through and caused all manner of problems with the mixture. Sorry I don't have a part number but the two hoses are bonded together and come as a unit. As for where to get one? I look around junkyards but it might be worth calling a Volvo dealer for the part. Maybe someone else here can point you elsewhere.
By the way, while you have the cover off, look at the vacuum elbows on the tree and also at the back of the vacuum tree for wear. I had the cover wear a hole in the tree a few years ago.
http://img.photobucket.com/albums/0803/eroman/HPIM0095.jpg
Good luck,
Erwin
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