my 95 850 had a hose go, that went from the vacume tree junction(near distributor) to a valve below it. it took about a six inch hose. also from the same vacume tree i followed 2 white plastic hoses towards the radiator and the rubber lines at the ends were rotted. I read somewhere to not only check for dryrot but also see if they are overly soft since they could collapse under vacume leading to other problems. good luck