GRiSO stalls after start while cold

Hi,
since few weeks i have following troubles:

i start engine
if i then increase throttle slightly (like up to 2 - 2.500 rpms, engine will stall on reducing the throttle)
i have to let it warm up a bit, or keep it around 2.5 to 3000 rpm that engine will not stall
i did check the log - no errors
i did reset tps
i did not balance the throttle bodies yet.
i do use beetle map since a year, had no problems so far.
what i had: i did drive for a week and maybe 50 km without speedo, as i had cable issues.

any ideas ?
thanks a lot !

P



My model: 2008 GRiSO 1100

did balance throttle bodies today, runs very much smoother now.
lets seed what that did with cold start behaviour