Help me tune my 4 Barrel !

[loudaddy]

So I finally joined the Dark side, strapped on a turbo and a 4 barrel Holley.
I have been having trouble getting it to idle. after about 10 seconds it will
"cough " back up through the carb , stumble and die. i set the butterflies to where the transfer slot appeared square, tried various settings with the idle mixture screws,(around 5/8 of a turn out seemed to make the most crisp throttle response)
but i have to be somewhere around 2.5 turns out to get the best idle. but with the screws out that far, the off idle performance suffers. i recently had a very lean mix and found the silicone couplings were leaking. Now since i replaced them its getting closer, but not right. I hope someone will help shed some light!
Thanks! ...Lou  
Here's my combo:

2276 8.3to 1 C/R
CB 82 Crank w/ weldmated flywheel(13  lbs)
5.4 Hbeams
Mahle 94 barrels and pistons
wedgeport 44x37
welded and ported end castings
custom turbo grind cam close to fk10 on 110 lobe centers
straight cuts
pauter 1.3 rockers
Over alternator 1 5/8 header
dc carbon fiber 4 barrel manifold
Holley 650 double pumper (72 main 82 secondaries -plugged powervalve)
Holley blue pump and regulator @ 6 psi
msd locked out 22 deg. mallory hyfire 685 ign.
chromoly 3/8 pushrods

[loudaddy]

Wow I m surprised that there was no responses, I had  2 pages on ultimateaircooled.com  it seems I have an intake leak Still. I will post results once I figure it out for those interested. Thanks , Lou .

[scottsain]

it sounds like an intake leak to me too.  i had a similar problem recently when my intake gaskets blew out!

[Ohio Tom (DdK)]

Sorry dude. I am battling the same thing on my setup.
However, I just figured out I have a huge intake leak on mysetup so I'm excited to fix it and re=test the motor.
I plugged off the inake side of the turbo and removed the rockers. I hit the manafold with compressed air and found a big leak.
Ooops..
 I think I can get an idle below 2,000rpm now... Maybe...