Hi Robert,
Look at the harness connector for #3 coil and you're likely to have a damaged/ spread pin. Clean with a toothbrush and 90% isopropyl alcohol, blow out with air
and you should notice if a pin is damaged.
Adjust or replace then lube with Penetrox.
BTW don't use solvents around connectors, some connectors get damaged from solvents, bullet connectors for one. I can visualize some tech cleaning connectors with spray carb cleaner and maybe damaging the connector.
Please remember to report back with your results.
Cheers, Bill
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