lack of power.

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Bought a 06 signum V6 diesel, in drive its fine until you put your foot down, 2 to 3rg engine revs right up then big thud goes into 3rd...

use tiptronic side , works fine red lines every gear....until i disconected it wont rev in any gear above 3500 revs...

anyone any ideas...

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Hi.....welcome to the Forum

It sounds more like the turbo being restricted (variable vanes clogged up with carbon) and going to limp mode when it reaches a certain rpm.
Usually accompanied by a P0299 fault code to state Turbo Underboosting

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