Autozone has some repair manuals which you can access free online.
This link may help
http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Engine+Mechanical&partName=Engine+And+Engine+Overhaul&pageId 00c15280217c80&subChapterTitle=Intake+Manifold&partId 00c15280217b40
Since it is a long link, I cant be sure it will work properly, but you can
go to www.autozone.com
register for a free membership,and go to the repair manuals section.
Here's a link to the procedure,
Read the reply by shiden_kai (Ian).
It explains in detail the procedure along with some shortcuts.
It was written for a Lumina MPV but I used the procedure when
replacing the manifold gasket on a Buick Century.
It really helped.
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