where that falls over is with tweaking your waste gate actuator..

It may have been just the engine in the disco I was working but the first time I fell foul of the overboosting power surge and cut deal swapping out then running the ECU in a deefer caused no problems but once it was in a disco it would keep hitting off on the overboost. wound the actuator rod out a little and that then seemed to sort the disco.

Both vehicles were manuals.