hey guys and gals. im having some problems with my r33 gtst series 1. when im driving only some times it feels like it drops in and out of power. but i have noticed when my air/fuel ratio gauge lights go out while driving thats when it does it. i have change my o2 sensor and it ran good for awhile but now it seems to be getting worse. just wondering if any would be able to help me out im out of ideas. thanks heaps