Hi i own a mondeo ST220 2007 V6 model. Just recently it has started to run really badly.. Whilst waiting at lights or waiting for it to warm up the revs seem to be going up an down on the car and its like its losing power...Also a good few months ago it started to make a very loud wurring sound i took it to a few garages one being Ford itself and they advise me as to buy this certain part it but it turned out it wern't that anyway. It has left people ( mechanics ) baffled... Does anyone out there no what this could be it's only done 30.000 on the clock