Are you sure it's not just the over-run fuel cut off ?
When you close the throttle, the fuel is usually cut off ... to protect the cats i s'pose.
If you're describing what i think then i get something similar on the IS200 ...
Say you approach a r/bout, lift off throttle, fuel cuts and you kinda jump into deceleration.
Then a slight touch of throttle, fuel switches back on and you jump into acceleration.
Specially noticable when it's warming up ... ie the idle speed is higher ...
Then, this on + off is happening about 1.5-2.0k rpm so 'jerks' are quite sharp.
Crap isn't it - and quite embarrassing - makes you seem like a rubbish driver !
Yes Yes, OK, so it's simply exposing the truth .... Ha Ha very funny
Does that sound like what you're experiencing ?