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There should be a diagram attached to the right front radiator support, on occasion it is on the under side of the hood. Each color coded line on the diagram is for a different function. EFI engines don't have a very complex vacuum system so repair is not nearly as difficult as it is with a carburated engine. If you need help in interpreting it, take a picture and attach it to this thread. Vacuum diagrams differ some what depending on the area that the truck is originally built for. The diagram is laid out like the engine, it should say front at the bottom and that matches the front of your truck.All of the vacuum line in my bronco are destroyed does anyone have any diagrams so i can replace them or advice. i also need to get parts