happens to me too...
ive just imported an 89 r32 gtst, and it drives like a beauty.
anywayz everytime i approch a light it stalls suddenly even on neutral.
so im guessing it may be the battery, ecu, or fuel pump?
also ive noticed that wen it has cut out, i floor the accelerator and suprisingly the engine just kicks back in...strange... i have a feeling its got somehting to do with the fuel pump as it has just been replaced with a bigger one....