I think I have a similar problem During sudden acceleration. About 3000-3500 RPM, the car stops accelerating, and starts to work unevenly. I must then reduce to 2000-2500 RPM. To Let the car start accelerating again

half a year ago i replaced
12 v battery
engine fluid
Cvt fluid

P0171 error sometimes occurs

 

Check oil level.

You might have a dirty MAF:

https://www.justanswer.com/honda/7d1...bank-lean.html


Furthermore, if you're having IMA battery issues, power can be horrible.

 

Oil level is ok. MAF sensor was cleaned
My battery is in poor condition But even when it is completely unloaded. At slower speeds (2500-3000) RPM the car slowly accelerates. And the engine works equally

HDS screen

 

Looks like HDS has already given you the list to check.

Good luck,

Steve