Mythbuster: continuing project thread of my 1303 '75

[70Turbobug]

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?