TF cor

Hi Guys I've been reading 1963 AP5 about the 34ADm Weber's and very informative. I've been making a manifold for my 4.1 crossflow for triple 34ADm Weber's bit of a challenge but done. Recently installed on to my Cortina 1981 TF and after reading some of the informative info trying to understand the operation of the carb read the Yellow Ford technical Bulletin and still having trouble after isolating the vacuum switch for idle jet found one has a ruptured diaphragm so plugged it up and the vacuum connection for the nudger diaphragm as you have done and shown in the pic's and still running extremely rich. Has a healthy cam and when I disconnected the 12vdc solenoid above the adaptor plate indicated in your picture, seams to settled down to normal not choking with carbon. Can some one tell me what the solenoid's function is, I'm thinking it could be some kind of valve for idle function. Look forward to any feed back would be much appreciated. Wish every one a great new year. Peter Sav.