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i don't really know anything about sr20's, but have you checked things like fuel filter, fuel pressure regulator, pcv, iacv, coil(s) (the sr's c.o.p. isn't it?), ect.
have you done a fuel system test or a vacuum test? i see you said checked for vacuum leaks, but not sure if that was just looking around for disconnected hoses or if you meant actually hooking up a vacuum gauge to the car and doing a test.
did you check fuel pressure, fuel pressure leak down, voltage at the fuel pump, ect?
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