I got an s13sr with a nissan quest alternator. I'd pop your ecu out and check for codes, if you have consult hooked up, leverage that if possible. I always feel upgrading to an aftermarket ecu and harness is always going to be the answer to a majority of my problems because I can see the faults in realtime instead of chasing demons.
Every now and again my car will randomly throw knock if it's cold and dump fuel fowling my plugs and 02 sensor until I heat the car up enough driving like an asshole to get rid of it all cause I'm too lazy to pull it off and clean the fuel and carbon. lol
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