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The shorts are usually due to corrosion from coolant wicking up the harness through a failed sensor or t-stat heater. Sometimes it's carbon buildup from burned connections due to high resistance in connnector(less common)
 

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Back the ign1 terminal out of the ECM connector, see if your short to power goes away. If it does you either need a new ECM or just need to clean better(likely taking apart the connector body and cleaning in between the female terminals) if the short doesn't disappear you have a physical short through the insulation, just run a new wire from the ECM to coil
 
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