Seat Alhambra

Hello, I am new and I do not handle this much, I have a Seat Alhambra 115CV Automatic and it does not rise well, the mechanic I design that it is the fault of the gearbox that does not give more, but the fact is that when it puts the computer it does not give any failure the turbo gives its balls the flow It is from the year 2001 and the change is 5 speeds with Trip Tonic, thanks