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Hi, Do you have the JWT ECU installed or some other ECU? Your power curve is typical of other cars after street mods: the stock ECU misinterprets the situation and desperately dumps fuel into the motor, thus over enriching and decreasing power. Just an idea. If the ECU is JWT then your symptom results from something else. I would not be surprised if over enrichment was still the problem but for some other reason.
- John

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