I'm gonna agree that it's the injector/ecu combo.
Going through a headache of my own after throwing 600cc injectors z32 maf and nistune board at my t25 redtop, fpr confirmed to be bad after install and is choking motor with fuel in boost. FPR would usually cause an overfueling issue if im not mistaken, underfueling has got to be related to the smaller injector size and/or ecu not bening able to handle data parameters you're throwing at it
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