Stalling at higher RPM's

Good afternoon.

Several possibilities.

1. low fuel pressure from a failing fuel pump. pressure needs to be checked and verified.

2. clogged catalytic converter. common issue. the catalytic converter gets clogged and does not allow the engine to breathe.

3. timing. you have a timing belt. if it is worn or loose, it will change the timing and not allow it to perform properly.

Roy

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator