My email never sent me a notification you replied. Sorry. It is on the back of the lower intake. I would first check and make sure you somehow didn't knock the vacuum line off, or crack it, etc. I can only find a picture of a 99 on google images, and it is a bit different than yours. The 97 and 98's were the only years that were vacuum. The one in the pic is electric.
Also... there's a white plastic bushing you can see supporting the control arm in a couple of areas. Those like to deteriorate and break. Sometimes when that happens it will allow the arm to fall out of the hole. Or not fully engage. You can purchase those individually instead of the entire IMRC motor.