Ok guys i recently put long tube headers on my 02 gt. When i did the check engine light came on, so i turned off my o2s with my diablo tuner. After i turned the o2s of the car ran horrible stumbling and falling on its face. So i turned the 02s back on and the car runs fine once again but now the check engine light is back on. Is there any suggestions for what i could do to have my light off and still have a great running car?