I suffered this problem several times when towng. It appears that it is caused by a build of of carbon in the system. The EGR return pipe ( chrome pipe top right hand side of the engine), sticky turbo blades to mention the main offenders. This problem eventually causes a loss of power when under load.
My service garage reccomended cleaning out the EGR tube which was full of carbon and adding a system cleaning fluid to the fuel then giving the car a good blast up the road to get things moving. It did the trick.
Diesel engine oil contains a detergent property which it meant to keep the system clean. It would appear that Citroen have recognised this to be the problem as they have now reduced the service interval from 20,000 miles to 10,000 miles to rectify this. It also important to use the correct viscosity engine oil. It has taken Citroen along time to wake up to this!!!
Hope this helps
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