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When you lift the throttle at say 2 or 3000 rpm, the idle switch is activated (closed) and that tells the ECU about the no-load condition. As long as the RPM is dropping down but remains above idle speed (880), the ECU cuts fuel delivery (not sure about this point, but I remember reading this was a fuel saving feature introduced with the first generation of Motronic).
So in this situation, the cutouts would disappear because no fuel is delivered anyway.
I don't know about the other situations, but your problem could fuel pressure-related. Fuel pump, damper and regulator may need to be checked.
Also check your CHT ohms at various temperatures.
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Gilles
RoW 88 Carrera coupé
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