some serious doomerism by you there @RainingPistons... just because you're personally affected by it, there's no reason to push that clearly written by you but also badly written article on everybody...
You should never install injectors without getting an associated tune, so first step is to remove them and put the OEM ones back in...
Then take your car to a mechanic to get diagnosed, as you've just proven you don't know enough to diagnose a "running rough" issue, I think...
I'd be taking it back to the tuner, if it was that recent... Tuners have the ability to diagnose such sorts of issues, or at a minimum, refer you somewhere where they can diagnose the electrical side of things that the person you tagged experienced...
Of course you can do that sort of repair for $2k, but how many times is it worth it compared to an aftermarket ECU etc? as soon as the repair gets above $2.5k I think it's not worth it and I'd just go a haltech, of course, but that's just me.
well, the market will stabilize... the XR8 ECU can be replaced with a haltech plug-in, for example. There'll always be a market for ECU's if the vehicles are still around.