1999 s80---------po175&po172

[Fulvius]

Just recently,last my me loved s80 developed a stumble at idle.Scanned system for trouble codes and po172 and po175 came up as the problems.I have been reading the member solutions and a vacuum leak seems to be the one reason,however I have tried to search for this elbow on the front of the engine ,underneath the p/s pump but could not located. Please help if this has been a solution or am I looking for the wrong thing. Thank You