I also did an ECU reset, let it idle and warm up for around 20 mins, during that time the revs trimmed down nicely to where they should be, shut it off, restarted then took it for drive around for half an hour, it cut out a couple of times, during the end of the run I noticed when it was hesitating it didn't actually cut out but instead the revs were hunting and there was a slight improvement in not stalling, I'll find out tomorrow when I take it for a longer drive.
Maybe my TB has an erratic fault? or I have a fuelling issue !!??