Why doesnt my Saxo vtr rev over 3000rpm?

I have a 2001 Saxo VTR and for some reason it will not let me rev above 3000rpm, its as if theres a limiter at 3000rpm. i have changed the throttle posission sensor, the idle control sensor, intake air temp sensor and stil got the same problem Any ideas? the engine is a minta only 25000 on the clock.