Http://www.automotix.net/autorepair/diy/1990-chevrolet-v1500_suburban-repair.html
I found this site to be helpful no manual though but inciteful
http://www.chevytalk.org/fusionbb/showtopic.php?tid/244221/
hope it helps
SOURCE: 1990 cadillac deville vacume line mix-up
I have the same car and my basic diagram is still readable so I will get pic of it for you .
SOURCE: I need a vacume diagram for my truck it is idleing
Here is a link that will be very helpfull to you including what you need dont forget to rate my assistance thank you.http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Vacuum+Diagrams&partName=Driveability+%26+Emissions+Controls&pageId=0900c15280076be3&partId=0900c15280076b68
Fig. 52: 1993 4.3L engine - federal
Fig. 53: 1993 4.3L engine - California
Fig. 54: 1993 4.3L engine - California alternate
Fig. 55: 1993 4.3L engine - federal alternate
Hope this helps.
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