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Oh you have a stock Z with 740's? Ok then that answers the question if the injectors are too big. I'll talk to Z tuner about the chip. Could there be a problem with the ecu itself? I'll ask my mechanic to chck thr o rings and the fuel rail too. Now, the performance shop said that with a stick ecu, it should run fine because the safc tunes the injectors itself, so an upgraded ecu chip isn't needed. Is this true? I'm more confused now than ever.
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