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I was having similar problems as OP, where sometimes at WOT it would happen (but usually not). I was suspecting it was an extreme traction control intervention, so started driving with it off. In almost 2 years of driving with it off, it hasn't happened. When it would happen it would be scary, for example being stuck in the slow lane, and punching it to enter the fast lane and the engine revs up, but no power... And just like OP, the only way to get power back when it happens is to completely let off the gas - not something you want to do after pulling out into traffic.
I did catch it on a log once on a pull on a particular time when I had forgotten to turn traction control off. If your logging torque limiters you'll see them trip along with throttle plate and boost interventions. Doesn't make sense since i'm x-drive and can't light up the tires, but for some reason every now and then the traction control thinks all hell is breaking loose (when it isn't) and starts cutting power. Now I only leave traction control on if it's raining or driving in the snow.
Edit: first noticed on stock tune w/ stock parts. Now i'm mhd 2+, catless DP, intercooler, and chargepipe, and it will still happen if I don't turn off traction control.
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