[Discovery 3 Limp on acceleration]

Please can someone help me have a problem just about the same with my car garage has had it 6 months and can diagnose it

[Revs then cuts out. Please help garage has had my disco 3 08 plate for 6 months and unable to diagnose what it it]

Please help. 

Welcome any phone calls for people willing to help

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EDIT: Suggest anyone wishing to approach the OP directly use the Private Message system or post below so everyone can benefit from the information.