could be starving for fuel at higher rpms/load
load her up and try it at lower rpms, if the symptoms occur at lower speed and more load you might not be getting full fuel pressure in the supply to the injectors...
if thats the case then it could be your pump... (have someone sit behind the vehicle and listen to it while you cycle the key on and off. (30seconds between swithces and keep your foot of the noise pedal)
There are other things it could be but thats about the easist to check...


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