After speaking to a weber carburettor specialist about my issues with the Green Cortina, I was advised to try changing the idle jets to a bigger size. Being a twin choke weber there are two jets, a primary and a secondary.
The standard sizes are 55 & 50, so I purchased two at bigger sizes. The first combination I tried was a 60 & 55. I then took the car for a long test drive. It did make quite a difference and the car felt happier a low speeds and the popping and banging on the over run reduced dramatically.
I then returned home and decided to change them again. This time I tried a combination of 65 & 60. I went for another test drive, but to be honest it didn't really feel much different to the first run. (Although I didn't go as far)
The car is a lot more drivable though, but removal of the spark plugs showed that they are still quite white, so it appears the engine is still running lean. I think I'll need to having a chat with the carburettor specialist again to see what the next move is.
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