On the air intake is a pipe that picks up hot air from the exhaust manifold ,where this pipe joins the air intake pipe is a vavle which is operated by a bi.metal strip thermostat ,so when its cold it allows vacumn from the engine to open the valve allowing hot air into the intake which stops it from freezing up around the butterfly ,Something is wrong around this area but without having my head under the bonnet i couldnt say ,if your in doubt ask a local mechanic to have a look they will see the problem straight away
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