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The relay feeds all 6 injectors, o2 sensor heater, pcm, ignition coil. I would start with the most vulnerable the o2 sensor. unplug the pre cat/upstream and try. Then the downstream. These have heater elements inside that tend to short out. If this does not resolve then I would go with the coil. Then Its time to diesect the harness. Let me know how you make out.
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