Sounds as though you're loosing boost pressure. You'll need to inspect all associated hoses related to the turbo. If they're all intact you'll need to pressure test the intercooler.
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Liam...
'96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.
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