How Many Vac Hoses in GMC Jimmy? Is this Mechanic At Fault?

Tes there are many vacuum hoses on your Jimmy. The 1st guy should have heard it and should give you some kinda refund. If he does not tell him you will be calling the BBB to report him and then call them and be done with it. It really don't take all that scanning for a vacuum hose. They are very loud and any decent mechanic would realize what the problem was.