OK, thank you all...
Stevo, I had already checked for some airleak.
The car drives perfect on all other ocasions: idle at cold is just over the lower dot, and just below the upper dot when warm. When I hit 3500 RPM, it looks like some jumbo jet just hit my rear bumper!
I have a free day tomorrow, so I'll have time to check the TPS problem. What value should we read on the computer?
Other question: is an RS500 TPS the same as my RWD Sapphire's?
Thanks again!
PS Tabetha, what other things are you thinking of? I could test them tomorrow as well at the tuning garage... though last time I went there, the man told all sensors were giving correct values???