citroen c3 erratic acelerating

I have a Citroen C3 diesel/Exclusive,the cars problems are, if i am travelling at 50mph and try acelerate it causes the car to judder, and behave as if its got kangaroo juice, this also happens ,if in 4th gear under load it replicate itself,my car is 3mnths old and as aprox 3,500 miles done, i would be gratifull for any help before i take it to dealer, ALSO for the love of mike, what is it with this stupid indicator/ cancell and it still carrys on blinking,even if your not going to complete the turning as a lorry driverof 30 years i welcome any technoligy that helps us to drive safer but this indicator on a motorway is lethal, this my 5th citroen all picassos, so if anybody can throw some light on problems it would be appreciated god bless safe driving

"my car is 3mnths old and as aprox 3,500 miles done" - I would take it back to the dealer as its still under warranty. The juddering while trying to accelerate is not at all normal for the diesel.

I would suggest air filter, fuel filter, injection pump. (check/renew in that order), but let citroen put it on the computer under warranty.