Renault Kangoo 2004 fault

I have a 2004 Kangoo van, Sometimes when sitting at traffic lights as I went to pull away all lights would come up as if the engine was going to cut out and then correct itself, I took it to a garage and it had a plug in done and a new egr valve fitted this problem still occurs but no where near as much, Also if i turn sharp left like coming off a motorway the stop light and handbrake light come on does not do this going into a right bend and then corrects itself I thought this may be a fuel problem but does it with a full tank of diesel. Any ideas?