xmotocrossx04

I just installed my new pacesetter 2-1 headers and just wanna know if there is anything that needs to be done now that I have this new set up. 86 na still oe mufflers and cat. My cars idle sucks now I cant get it to stay anywhere every light I pull up to it sits somwhere different and it bounces sometimes to my car is also alot louder so ne ways ne help would be great thanks