I have a 62 plate SL27 sport Trafic which has developed an intermittent juddering for around 5 minutes or so every few days. The symptoms seem to start with the braking feeling like the ABS has gone into overdrive and very juddery and driving normally the van vibrates. This lasts around 5-10 mins and then the van is back to normal for a day or so. There isn't a distinct loss of power during one of these episodes and i can generally maintain speed within reason. I did have issues with the regen last year as the turbo was leaking oil into the air intake and after a recon turbo was fitted i haven't recieved any of the dreaded 'check emissions' or 'check injection' warnings. I thought it was the van performing a regen but the brake juddering doesn't seem consistent with that. There are no fault lights on at all. Any ideas????