Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing K&N filter warm air pipe

In the box of bits that came with my Morgan was a plastice pipe with a metal bracket thing at one end. Apparently it connects to the side of the K&N filter somehow and directs air from the exhaust manifold area. I've seen a picture of one fitted to a Fiesta with the Specialised Engines 1.9 CVH conversion and it's to prevent cold air entering the carb for long periods. But does anyone know what the effects are of cold air entering the carb for long periods? It wasn't fitted to the car so could that have been the cause of the throttle sticking I experienced after an hours run on the motorway on Christmas Eve bring the car home?

Thanks in advance.