'93 Suzuki Jimny Acceleration Issue

I have 1993 Suzuki Jimny Manual right side drive from Japan. The car has been running fine and out of no where today the engine started to make a loud reving noise and the car wont accelerate past 2500rpm. I stopped driving the car but I am hoping figure out what the issue could be. Any suggestions would be greatly appreciated.

In the States it’s probably called the Sidekick

And on the Sidekick, there’s a component called the Idle Air Control valve.

https://www.rockauto.com/en/catalog/suzuki,1993,sidekick,1.6l+l4,1271393,fuel+&+air,idle+air+control+(iac)+valve,6072

This controls the idle speed under all conditions.

Tester