I've got an 84 Z, LG4, no major mods. I can't figure out what's wrong with the carb. I can't get the car to idle below 1100 rpm. I've backed the throttle screw all the way out so that it isn't even touching anymore, but it still won't idle down. The car also has a skip at idle. It isn't very noticeable when driving, but it doesn't idle smoothly. I've put in a new TPS, I've took off the baseplate and cleaned out the idle screw ports and vacuum ports, and I've checked to make sure that the throttle blades are closing all the way. I've borrowed another carb and put it on and the car runs fine. So, it has to be my carb. I've ruled out a vacuum line too, since it runs fine with the other carb. Any help would be greatly appreciated. Thanks.

 

Are the secondary blades closing all the way as well? I've seen that link bent so that the secondaries are held open slightly. With a CC system, the mixture would be compensated but only through the primaries, so the mix to all of the cylinders may not be uniform.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).