Adjusting the TPS?

Does anyone know how to adjust the Throttle Position Sensor?
When I give full throttle, the TPS only register 96.8% throttle. How do I adjust the TPS to give 100%?

My dealer confirmed what you said, orpheus. The front TPS should be between 0.56 V and 0.64 V. The rear should be 1.0 V.
I hope that'll sort my idle problems out...