carb difficulty, could someone help please

[Buzzmobile]

Ok, let me first state that I am NO carb mechanic...and that I have 2 of them on my cobra Here is what is happening. When I am driving, I come to idle and it settles down in a nice idle for maybe 30 seconds. Then, it drops to a second, lower RPM idle, which nearly causes the car to stall. If the car is all the way warmed up, it will still idle at this lower RPM barely, but if not totally warmed up...I have to ride the gas a little at lights. I have checked the linkage over pretty well and have good springs to return the mechanism to its idle position, so I do not think it is the linkage. It seems like the car settles on the first idle with fuel from one part of the carb and when that runs out, it starts using a different circuit....if that makes sense.

Anyway, any help is greatly appreciated. I am also trying to dial in the idle mixture, which I think is getting pretty close to where it needs to be. Could that be part of this problem. Maybe a step by step instruction to set all this would be good. I plan at some point this year, to take it to a chassis dyno and have it really dialed in, but right now, I need other things for the car more...so that will have to wait


thanks again
Buzz