Well have just stripped and rebuilt/refurbed the carb.
The car actually starts in the cold, and idles now
However, the idle is very very lumpy (without the choke on ) at any temperature.
If the car is rolling, and you put the clutch down, or put it in neutral - and at the same time you are slowing down by braking, it makes the engine cut out.
If the car is stationary, at idle, pressing the brake DOES NOT make the idle change.
So in my theory it is something to do with gravity. There are no probs under throttle at all, only idle ( or cruising with a trailing throttle )
Could it be when braking while moving that the fuel is moving about in the ( carb, fuel lines, pump, fuel tank ) that is starving the engine or making it overfuel ?
The carb was fitted with a new float valve, and the original float appeared to move alright.
Thanks again
Mark
edit (yes i know, the title is meant to be carb, not car :P )