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What was the reason why you changed the ECU? Definately an emissions problem. Could be that the ECU you have in it now is for a OBDI system. I believe some where between 95-96 Nissan changed to a OBDII system. Like you said check the evap system on the car Canister crack, loose or unconnected hoses, bad sylenoid valve, etc. I am leaning towards that the ECU is not communicating with your emissions system. Is it Cali or Fed spec?
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