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I have read about this in a number of posts but no tuner has said anything other than this is normal. No one have offered an explanation. I wonder whether it is a hardware limitation rather than software. On my old car with twin weber carbs and a big cam, the resistance in the throttle changes noticeably when the cams/power starts to kick in. It maybe the increased airflow at high RPM causes the throttle to close slightly on the FA20 but that is pure speculation.
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