3z5x06rz

I have a 2003 350z. Cold Air intake, headers, test pipes, hkw replika exhaust. My car is running rich with its Long term fuel trim for bank 2 at -25.0 and bank 1 at -24.0. That has been going on for awhile I have been trying to fix that but can't. This morning I started my car and it ran at high idle for a little bit the just died suddenly I started the car again and it ran rough I drover it down the road and every now and then it felt like the engine died and started again within a split second. I was headed to work and it would rev over 2500 rpms. I turned around and took it home to find out it was still in open loop maf read fine o2 sensors were reading all above .97 volts and wouldt drop lower. Can anyone help me fix my car.