Repost this in Forced Induction section, you'll get your answers quicker.
To me, it sounds like somethings cause the ecu to go limp mode, but find a workshop that is familiar with 34s & can get consult on it... but the problem may be caused by sporadic issues (eg. afm wires coming loose momentarily)
Ring around a few workshops and see if any of them recognize the 34s symptoms.