I ran 2 seperate relays for my fans with seperate 10G wires to power each one, and that solved a shit load of issues for me. Although my fans flow like 3600CFM, so when the fans come on at a red light or something the car drops like 500rpm for a second, lmao.
Also, after inspecting plug gap (I run mine at .028 on my KA with LS coils) you might want to inspect the coils for a weak one or just swap to LS coils. The JZ coils are known for going to trash in their age.
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