Any thoughts on things to look at / check?

This has only happened a couple of times, basically the engine just cuts out.  Always at low speed, normally when braking for corner in the village or at a junction.

No warning lights, stick it in park and restart it without any problems, when running engine appears to run absolutely fine or at least I don't notice any problems.

Happened once a while ago and I forgot about it, just got the car back today after having the broken manifold studs removed and replaced.  Drove 3 miles home without a probelm, then went to pick up my son from school about 30 mins later and it cut out 3 times in the first mile of the drive through the village, after that ran perfectly fine.

Not sure if it maybe idling a bit slow, I gave it a quick look and seems to be around 600rpm idle (not sure what it should be).  Will check better tomorrow when I go to work.

Any thoughts?

Thanks,  found the guide on here now so will see about going over it this weekend.

http://www.omegaowners.com/forum/YaBB.pl?num=1194007453