Surging and Bucking

[Shaolin Crane]

I just installed some Doug Thorley shorties on my 07 GT and sometimes when its cold and i put the car into reverse it kinda surges backwards or bucks like the idel control is bouncing too much instead of being smooth like it was with the stock headers, i also noticed that idle is significantly lower than it was before sitting around 500-550rpms, any help would be great

 

[89hatchlx]

I know if u mix up you 02 sensors you can get similar problems as to what ur dealing with, essecialy if its cold. Or if u used antiseize on them and got some on the actual sensor itself you may have ruined them. See what other people say before u go replacing them, just my .02 Good luck