The sudden loss of power, while still running smoothly, is usually ignition related. It's also possibly a vacuum issue. The fact is....the U.S. spec. TRs with K-Jet fuel injection are quite complex, there are many little components that must work for everything to function at optimum. Off the top of my head, here is a grocery list of items to try. It's very hard to diagnose the problem over the internet....so.....
Verify there is spark at both cylinder banks, maybe use a timing light for this.
Check the coil lead wires, sometimes they slip down out of the coil, or deteriorate.
Unplug & Replug all of the electrical connectors in the engine bay, there are a lot of em.
Check all vacuum hoses for any damage, or any that may be disconnected.
At the mother board in the trunk, check the white connectors at the bottom of the board for burned connections, particularly for the fuel pump circuits.
Check things out and let us know what you find.....