Try autozone.com They have a good "Emissions" section, that breaks down into componets. They don't have everything ever invented, but they have the biggest slection of vacuum diagrams, all on one site, that I have ever found.
It is a vacuum line diagram for a 1988 Toyota Corolla. What else would it be. :-) Just playing. You can find one [http://www.themotorbookstore.com/corolla2.html Here]
A link to more information about the Toyota Supra can be found in related links.
I have a 1988 chevy s10 pickup 2.8. I went to the service department at my local chevy dealership and they printed out 3 diagrams for me for free.
You can find a 1988 Toyota carburetor diagram at most Toyota dealerships. The diagram can also be found in Toyota service manuals at your local library.
I do not know about a 1988 Isuzu PU, but I have a 1992 and the vacuum diagram is on the underside of the hood. You may need to clean it up a bit to see it. I did. Hope this helps. morempg2u
Vacuum diagram for 1988 Volvo 740 gle can be found online in the images section of google search. The search should be done with the keywords 'vacuum diagram 1988 Volvo 740'.
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how do you hook up vacuum lines in a 1988 Chevy nova
Vacuum hose diagram 1988 gmc s15 2.5
The vacuum line diagram for a 1988 Nissan Z24i can be found in its maintenance manual. It can also be found in the cars repair manual.
You just unscrew it.
give up...plug them.