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Fuel vapor would be an explanation.The question then would be does the ECU cut fuel completely or just reduces fuel by say 95% or does it restart as Bruce mentioned? The engine stays running so maybe just the amount of pulses are reduced.Some OEM cars limit there rpm in such a way that the engine simply does not rev higher instead of the usual rev limiter chattering.Maybe a sort of trick to the MAP or MAF telling it that max airflow is reached?
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