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This will be a VW Tdi engine, there are various faults that will cause this problem which is basically that the engine is in 'limp home' mode with much reduced engine power output.
Usually caused by faulty MAF, not in your case as it has been replaced, or split turbo hose, leaking intercooler, jamed turbo variable vanes, faulty boost pressure sensor.
You need to get the fault codes read, then search on here or vwaudiforum against those codes.
Hope you get it sorted.
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