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I chased this exact problem for 14 years. Replaced everything, car was auto converted to manual so there is no starter interlock relay. Ignition switch helped but still did it all the time. I work for Wiring Specialties so believe me I searched, replaced, tested, checked grounds - all of it. Nothing helped.
Finally, I completely bypassed the OEM wiring and added a simple START button right in the cigarette lighter hole. Triggers a heavy duty relay under the hood connected to the start tab and it always cranks every single time now. Button is Ignition powered (lighter wiring) & I had to run 1 wire up to the relay.
Most stubborn S13 problem ever.
DONE
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