Q&A

 Master

There should be an emission decal under the hood showing vacuum hose routing. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
Try to locate a similar truck to yours at a car sales lot and take a digital picture.