I recently bought a 2001 ECHO and am delighted with the car. However, there is one interesting characteristic of the car that I am curious about. It seems like, as soon as the car is warmed up, I hear a high-pitched sound (very much like the sound of break squeal) when the throttle is in a certain position (or maybe is it a certain rpm). If I alter the position of the accellerator the sound stops and I only hear it when the accellerator is in that particular position. However, altering the position of the accellerator of course results in going faster or slower than desired, so I hear this high-pitched squealy sound quite a bit. Thanks for any knowledge about this that might be out there.......