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are you still running the dx fuel pump and if so did you run your car on a dyno yet? the tiny dx pump wont be able to supply the fuel you need on the top end. another thing, since its an obd2 motor are you sure you have only the primary oxygen sensor wired up? and not the secondary?
my advice, go do a baseline run on a dyno hooked up to a wideband o2 sensor and see what your a/f ratio is. then if thats ok get an obd scan tool and run it in real time mode and do some rolling starts and off throttle crap and see what happens to the a/f according to the o2 sensor.
i think your right about the lean thing, sounds like the pump cant handle hard throttle transition or top end flow period, like it just doesnt have the umph...
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