Engine problem in cold condition

Servus together, has a Renault Trafic 2 since May of this year and now has the following problem. If I have to drive and brake from my garage with a cold engine to the road junction (coupling has gone through) the engine chokes itself almost by itself, but shortly before dying it catches itself again. However, the problem only occurs if I have to brake, if I let it roll out it runs quite normally in the stationary gas. Is quite annoying, maybe someone can help me further. mfg Auto data:Renault Trafic 2 1.9dci Bj 2004