When I start the truck it’s fine until check engine light come on and if I give it gas it stalls but if I burly give it gas it’s fine and I change fuel pump, filter, injectors,throttle body, más air flow sensor, tps , and I don’t know what to do I think it’s my speed sensor that come out my dash but I don’t know

I own a Tacoma TRD 2004 manual 4x4 and the problem is the following: when driving over 30 mph, an annoying screech appears and increases with time. It only disappears when gearing and pressing the accelerator. When driving in third gear, I noticed that, if I speed the car up, the screech goes off, but the speedometer suddenly drops and the vehicle loses speed. Can someone help me or explain to me which the problem might be? Thank you.