I have a 2004 mondeo tdci 13o and it has developed a problem. When crusing on motorway all is fine until i accelerate, all i hear is a loud rushing of air, when i lift off it goes away, this also occurs around town when rpm is aroung 2200 rpm, there is the occasional flat spot when this happens and as rule fuel ecconomy does not seem to be effected, please can anyone help
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