hey my car has been doing this for a long time now, it seems to pop pop pop pop and hesitating if im taking off from a stopped position, if im gentle it doesnt do it but if i take off a bit quickly it will do it, it used to only do it with 91 octane but now does it even on 98. Its much worse on hot days, it happens alot worse on high boost but still does it but not as bad on normal boost. Could this be coilpacks? the car is an R33 GTST S2, no real mods and high boost is only 11psi and low is about 6psi