2001 Peugeot 406 engine cuts out

engine cuts out mainly at junctions and roundabouts it does it with what i would call a clutch judder then cuts outs as if its driver error the car just shuts down to get the car going again i uncouple the live feed to the battery leave it for 30 seconds or so re couple the live feed turn the car over and she starts no problem but its now got the engine management light on and the antipollution light on as well the car can then run with both errors for sometime before it does it again diagnostics first said there was a problem with all 4 injectors which have all been changed the car runs like a dream and then will just cut out without warning am at my wits end someone please help