Seat Altea running rough .. .. spluttering

Car: Seat Altea
Variant: 2.0 Turbo diesel sport
Model Year: 2006
Categories: Running Rough, Starting & Power Loss
My car runs really badly between 2000 and 2500 rpm, with little power when you try to accelerate. This problem gets significant better when the fuel tank is near quarter empty ???

No engine management issues, no other issues. I have run two tanks worth of fuel with STP diesel injector cleaner .. .. Not any better or worse .. .. Any advise greatly appreciated.
Posted: Dec 9, 2011 (12 years ago)
Check the boost pipe .
Posted Dec 9, 2011 (12 years ago)
This link should help you ,

http://www.seatcupra.net/forums/showthread.php?t=231225
Posted Dec 9, 2011 (12 years ago)

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