Occasional warm idle stall on 2.25 petrol

Hello folks,

For the past few days, I have had an occasional warm engine idle stall. Other than the couple of times that this has happened, it is running beautifully.

Any thoughts as to why this might be happening?

what carb's on it? mine does it as well with a webber, cuts out coming up to junctions sometimes. no idea why, just putting up with it. have cleaned all out and messed with linkage, still does it. increase idle speed doesnt change it as it seems to have got 2 idles, one that very low and one that you can set with the screw. stalls on very low one.