well, i had this problem for a long time but finally got around to see what it was.

whenever, i give it gas from a stop, i kinda have to force the gas pedal slightly sometimes to get it going. thought it was the TB cable getting stuck or something but no. checked multiple things then check the tb butter valve.
whenever i pulled the TB cable up, the valve doesn't seem to open freely 100%.
its nothing too terrible, like i said, it happens every now and then.
maybe the last owner removed it for some reason i don't know.

i know nissan prob have a special instrument to calibrate it perfectly which they'll charge who knows what, but are there any other cheaper solutions?