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Hello mate.
Is yours a CRD ? And are you getting any codes ? (providing you have the means to read codes)
If it is. I had the IDENTICAL symptoms to yours. And after a long time tinkering with needle 'n dawes, it was still doing it regardless, every time I punched the car to overtake.
To cut a long story short. Mine ended up begin the rail relief valve. I was getting codes P0087 & P0192.
In a nutshell when you gun it, it doesnt matter what boost you're running, the fuel pressure in the rail becomes too much for the valve and it triggers a limp mode.
Might pay to check this.
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