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You can find a 1986 Winnebago, with the Chevrolet 454 cubic engine, vacuum routing diagram at most Chevrolet dealerships. The vacuum routing diagram can also be found in most Chevrolet engine service manuals.
Chiltons service manual
There should be a diagram of the vacuum lines on the passenger side shock tower.
When changing the timing chain on a 1986 Dodge Aries 2.2L a diagram comes in handy. A diagram for this can be found in the cars maintenance manual.
There should be a sticker under the hood that displays the vacuum line routing.
You can find the 1986 Chevrolet vacuum line diagram at most Chevrolet dealerships. The vacuum line diagram can also be found at most auto-parts stores.
the diagram you are looking for is on the fan guard connected to your radiator
there should be one on a decal under the hood. otherwise look in the apropriate copy of "motor manual" or "chilton's" or a factory manual
usually there is i sticker on the core support showing the vacuum diagram. If its not there then i would spend 20 bucks on a chiltons manual.
on line
There should be a diagram of the vacuum lines on the passenger side shock tower.
look on eBay for 1986 Nissan service manual