Most vehicles have a diagram on the underside of the hood that shows the vacuum line routing. Just open your hood and look up!
You can do a google image search on "1986 comanche 2.8l v6 vacuum diagram"
Here's the direct link to a diagram, though I'm not sure it will work here:
http://images.google.com/imgres?imgurl=h...
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IT DOESNT HAVE THE DIAGRAM UNDER THE HOOD THE TRUCK DIDNT HAVE A MANUAL I GOT ONE AND IT ONLY HAD THE STRIGHT 4 DIAGRAM
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