If your is suffering from fuel cut it will be because the car is boosting above about 1.3bar. The car will boosting higher than normal right now due to the cold weather. Assuming it is fuel cut, is the car modified in any way to enable it to boost this high? If not it is likely there is a problem (sticking actuator perhaps) and you should look at this rather than try and stop the fuel cut which is a safety mechanism. If you want to keep this level of boost then you really should be looking at changing or playing with the standard ECU.
Fuel cuts are very harsh and not good for the engine, you might want to take it easy until the problem is solved.
What makes you think it is fuel cut? I've known a few cars, including my own, that have felt like they have been having fuel cuts but in all cases it turned out to be a loose electrical connection.