just a dumb question

is it possible to get a new owners manual for a 91 z34?

I dont know about flat out new, but you can get a like new one on ebay most likely. I got the manual for my 2000 on ebay and it was just as good as new.

http://cgi.ebay.com/ebaymotors/1991-CHEVROLET-LUMINA-OWNERS-MANUAL-WITH-CASS-IN-CASE_W0QQitemZ260219647900QQcmdZViewItem?hash=item 260219647900
http://cgi.ebay.com/ebaymotors/1991-CHEVROLET-LUMINA-OWNERS-MANUAL_W0QQitemZ370033696600QQcmdZViewItem?hash=it em370033696600
Factory service manuals are also available if you plan to do your own repairs and maintenance on the vehicle.