You can do the fuel spider and intake gasket replacement yourself in about
an hour for maybe $300 all told. It will likely take you a little longer to
pull the intake plenum/cover the first time but after doing it once, you
should be able to do it in about 20-30min. As I recall, a deep 10mm socket
is your friend on this one. There's an ebay seller that carries OEM GM
parts at a great price. I bought my new spider from him and never looked
back. I wouldn't pay $1000 for this job but then again, that's just me.
There's a chance that you can replace the pressure reg on the pass side of
the fuel spider - I believe 'Help!' makes a kit. All you need for that is a
small torx security bit and it usually comes with the reg. As well, it may
simply be the 'nut kit' which is the plastic hard lines that secure to the
spider/regulator itself. The best thing to do is to pull the manifold
tuning valve and look into the plenum/intake for either pools of fuel or
very clean and shiny spots (to indicate fuel leakage). As well, you will
often get a miss on cyl#1 as there's a weeping hole right above it that will
leak fuel directly into the cyl.
I hope this helps. Again, as always... Check the fuel pressure first and go
from there. If it doesn't hold above 56-58 for a few minutes, there's a
leak and it's likely to be under the plenum. I've also seen the test port
cause the leak though and that has a replaceable shraeder valve in it. If
you do replace the nut kit, be sure to keep it as the valve/test port
unscrews from the rail and can be very handy as a replacement (as is the
bracket and torx screw to hold it on).
Good luck and let us know how you make out.