where is Mass air sensor on Galaxy 09/2006 ?

[mangalaxy]

I have a Galaxy Zetec with a Petrol engine 2 litre, year 09/2006 varient AOWA1M

The problem at the moment is that it runs smoothly from cold until it gets warm when the engine starts to hunt and cut out at idle. restart the engine and this seems to solve the problem?until next time

I thought it would be a good idea to clean the Mass Air sensor as explained in many problem shooting articles, but the problem is I cannot find it ?

I have had the airbox off and searched all round the air intake areas and there is not one to be found? ...... it must have one, but where is it ?

Any help gratefully received