Just fired up a fresh rebuild with a Holley 390 and it won't idle below 1500 RPM. The idle stop is loose, so it isn't that. Any ideas?

bwhitejr

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'72 Duster (Performance 360)
'83 Ramcharger (Performance 318)
'80 TrailDuster (360)
'80 D-150 Truck (See Below)
CompCams 252S, Holley 390cfm, Offy manifold
Ported, Polished and Gasket Matched
P4286813 Springs,0.040 Overbore,
0.090 Shaved Head

Vacuum leak, throttle linkage too tight, or the secondary's cracked open.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

too much carb for your car, at least on the idle circuit??? inspect how much of the idle transfer slot is showing under the blades. Does your car stalls if you close one needle all the way down? if not, idle's too rich, you may need to drill the blades. Start with 1/32" and go by 32"s till it idles fine and you can actually kill the engine by closing one idle needle all the way down.

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

Sounds more like a vacuum leak to me. I did manifold swap and had hella leaks where it sealed w/ the head and had a very similar problem. Redid it properly and the problem went away.