It sounds like a dodgy sensor somewhere, but which one !!
If its not OK at cold but OK when hot there might be a problem with the engine coolant temperature sensor. Think of it this way, the mass airflow plus the engine temperature gives an arithmetic value which is then compared to a fuelling map in the ECU. If the coolant sensor reports the engine is warmer than it is then insufficient fuel is going to be commanded by the ECU for what is a cold engine. The other ECU adjustments via other sensors are mostly just trimming adjustments, although there is an input on speed of throttle opening which has a fairly large effect once the car is moving.
If the MAF sensor was dodgy the effect should be at all engine temperatures
At least that is how I see it !
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