Hi,
I assume the mounts you mentioned are the motor mounts. So, if that is tight, then we need to consider other components that are directly affected by throttle position.
Have you checked all front-end components such as control arm bushings? Also, the front axle joints could have excessive play. Have they been checked?
The Yaris wasn't offered in the US, but I believe it is the same as the Echo, which we do have. I attached a pic below. Check the items I highlighted for evidence of damage or excessive play.
Let me know what you find.
Joe
See pic below.
Image (Click to make bigger)
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Sunday, September 25th, 2022 AT 7:32 PM