4Runner Reduced Engine Power

I had something similar happen with my old Volvo V70. Same symptoms - felt like I was driving a lawnmower. Did you check the main relay? That was the culprit in my case.

The main relay, huh? Where is that located typically? And how would I test it? Is it even worth checking myself, or am I better off just taking it to the shop?

On my Volvo, it was in the engine bay fuse box. Testing involves a multimeter, but honestly, if you're not comfortable with that, just take it to a shop. Could save you a bigger headache. Seems like the faulty relay could have fried the ECU.

Thanks a million! You were spot on. Took it to the shop, and it was indeed the main relay, messing with the ECU. 120€ later, she's running like new. Appreciate the help!