Sounds like the TB, tried logging it, my TB could not align properly its angle would always be changing (I know AGU's are cable, but the butterfly valve can align a few degrees for carb deposits with the little motor and potentiometer on it). It would cut power randomly, judder when you apply power etc, sometimes when you want power it will start picking up speed, then a nice extra kick would come in, then it will have down syndrome again... I'd say TB especially with the judder issue?