Mitsubishi Forum - Mitsubishi Enthusiast Forums - 2007 eclipse *need experience/knowledge help

Not sure what my problem is, the owner before me put in his own headers and cut out the cats. I recently broke an O2 sensor when hitting the curb but the issue im having has been re occuring since i bought the car last year. Ill throw some codes, the car will tap out a 4 RPMs and then eventually it was shut it self off, sometimes while driving other times while stopped. Before it used to start up and not do it for like a week or months. Now its doing it very very frequent. There are 4 o2s being used and looks like there is a 5th but its just there to plug a hole, 2 of the o2s have what some one told me are "Foolers" since the previous owner cut the cats out.

Any suggestions or someone to talk to that knows what the hell they are talking about i would really like the help. I do have the codes and descriptions written down somewhere just have to find the stuff.