This cannot be the trottle problem - but how was the car behaving when it was full on Xtra Premium?? Was it having the same problems of stalling very frequently?? To me it seems to be a problem of fuel quality - the bunk where you were getting Xtra premium - better change it and see.
Also, get the spark plugs cleaned and get the gap set.
Since you are saying that the car behaves well when full, better run it properly till it is upto 10 liters of Power and then check if the same problem is persistent.
In any case, get the clutch settings done - seems to be a problem with the Clutch than the trottle.
Regards,
K Prasad
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