2My 32 gtr daily has just had the exact same symptoms, did you find a cause?
When cold the power is hesitant. Not on boost just on gentle power then it sudenly releases and its smooth again.
I now and suddenly get it occasionally when crusing allong, it feels like it starves for fuel or air sligtly then releases. No issue at all on boost or wot.
Im running stock ecu, stock engine rb26 and although i have had no issues prior and no change and i daily the thing so i know, something has deteriorated. What should i check first?
Plugs or coilpacks, even injectors pumos and so on would have to give me issues on wot i would have thought?
Im guessing something more electronic like cas or afms, can i trouble shoot these somehow when its such an intermittant and specific issue?