When pressing the accelerator pedal thoroughly, the vehicle suddenly chokes. When releasing the accelerator, the engine vibrates and seems to be about to stall, but then revolutions raise slowly. I've already changed the TPS, CKP and oxygen sensors, the IAC valve and injectors; the engine has been adjusted as well, but nothing got better. Even more, when setting the D-type overdrive, revolutions drop and the engine stalls, without moving any longer.