I think we need to troubleshoot this a bit further. They don't go bad like you describe. If you were to replace them all, OEM injectors would be best. You're not out-flowing your stockers yet, not by a long shot.
Methinks you have underlying issues as Haro already pointed out.
Are you still getting that code, or has that gone away? Does the car stall, and the oil pressure then drop to zero, or does it drop, and then stall? Does the tach bounce around at other times, or just when it starts to have a problem? From the descriptions, it sounds like there is more than one thing happening.