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This is going to sound stupid but are your battery cables clean? I once had an ecu problem with my s13, not as bad as yours but i had problem. I have my electric fans wired to the condensor fan relay and all of a sudden they werent turning on anymore. Also the engine stumbled at times when idling and ecu wasnt grounding the relays, i got a complete ecu pinout online and checked every wire for 12 volts and ground and after like 3 hours of diagnosing, i decided to clean my battery terminals and fans kicked on! Weirdest thing, sometimes the simplest fixes solve the most complicated issues.
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