Idle issue with Galant 00 ES V6
 

I just replaced my Galant 00 ES V6 Idle Control Valve and before installing it, I cleaned the throttle body.

My issues is when idle at a traffic light or Stop sign, when I press the brake the car will feel like it pushing but when I drive is normal. the rpm goes below 500 when the brake are pressed, but driving is normal.
Did I do something wrong when I replaced ICV and cleaned the throttle body.