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Sounds like anything from MAF being incorrectly wired to incorrect ECU, or maybe your fuel pressure is dropping off under load.
I would start by checking your fuel pressure, under load if possible
If you are totally lost as what I even mean to say above then I would try to find a local shop that will do an affordable diagnosis.
I offer one for 80 bucks flat rate for basic and 160 for the more invasive one if you're interested.
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