Make sure the connection between your harness and the ecu is tight.
There should be a bolt on the back side of the connector. Tighten that to 26-43 in/lbs.
NOT FT/lbs.!!! (Pulled those numbers from the Nissan Silvia Manual)
I just had this issue with my car and a lose connector turned out to be the culprit.
Hope this helped, good luck.
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