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I have had this problem a lot, it has always been tuning issues. I can make it happen any time I like. Retard the timing too far... You'll find that the car will go OK on a certain amount of boost but if the boost rises too high, it just bottoms out.
A disconnected vacuum hose could certainly do this aswell.
Could also be plugs? I find that worn plugs have a hard time sparking correctly if the boost goes too high for them, also creating flat spots on full boost.
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