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Ok...so all 12 plugs are new single-trode with .023 Gap. Car was dyno tuned with wide-band O2 sensor and street tuned. We went through all the connections, voltages, etc....carefully and found no issues. Motec data logger shows no flags/errors. I am wondering if it could be an intermittent Expander or a ghost in the Motec? It's seemingly random so might be something loose that shows up on hard accel or decel??
Using the Motec M48 - which I understand is robust, but the logger software is hard to work with/check.
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