Hi, I have a 1.4 automatic Corsa C and it keeps cutting out at junctions, traffic lights etc. The revs go up and down and the car judders when I'm slowing down and then the revs just drop and the car cuts out. The problem is, it doesn't happen every time and I have taken it to two garages now and neither can find a problem.
I have replaced the lambda sensor as thats what the RAC guy said was the problem but it's still continuing to cut out. There are no error codes and apart from this the car runs great. Any ideas what the problem might be?

Thanks