Corolla 92 (New Thermostat)

Good day friends, I'm writing to see if you can help me with my question. I have a 1992 Toyota Corolla, automatic. Since I've owned it, the car has been without a thermostat. They say it runs better that way, and since I'm in Venezuela, the climate is warm, and it ran wonderfully. Now, I installed the original Toyota thermostat so my car would run as it originally came. However, the car feels sluggish when accelerating. Before, it moved smoothly and you could feel the engine's power. Is this normal, or do I have to wait for the car to adjust to this new part? I've already checked that the thermostat is working. When the engine is cold, the coolant temperature is static, and after a while, the temperature rises to just below halfway, and you can see the water moving. This suggests it's working correctly. I hope you can help me solve my problem. Greetings.

The thermostat doesn't directly affect engine power; you might only feel a slight difference, but nothing more. In any case, in climates like yours, it's not necessary to have it installed.

Thanks for the information, friend. I'll add something: before I installed the thermostat, the car's timing was off. The mechanic adjusted it, and that's why it felt more powerful. Then I installed the thermostat myself. Do you think the timing adjustment had anything to do with the thermostat, or is that unrelated?

With the thermostat nothing, but with the tuning, that is to say if he put it as a factory and was a little Adellnado you will feel it as well as was, but the thermostat nothing.