VAFC << 'Chipped' ECU (i.e. Hondata, Crome, Uberdata, Neptune, etc) / Standalone ECU because a VAFC is only a piggyback; it only cheats the ECU by sending out a higher MAP sensor signal, thereby altering the OEM's ECU load response and letting the ECU hit pre-programmed cells that have greater injector duty cycles than before. Problem is, your OEM fuel map does not have injector duty cycles above 70% on 7500rpm below. In short, no matter what MAP sensor signal the VAFC throws at the OEM ECU, there is a chance that perfect AFRs won't be achieved. That's why some people claim that these VAFCs lack resolution but in reality they can only do so much 'cheating' to begin with. Other people can counter this with hardware changes (injectors, pumps, fprs, etc) but sometimes (though often not, as long as your tuner knows what he's doing) idle quality and fuel economy suffer a bit though not by much. So continue as per your plan, have a wideband hooked up and do readouts then have your tuner judge if you can go VAFC or something else. That way, you won't be spending on something that you'll just be disappointed later on.
Cool, I think I have a faulty injector/s ... I was advised to start the car and remove the wiring (clip) from the injector individually, I noticed when I removed the first one it didnt make much difference, however when I removed the others the car felt as if it wanted to cut out. So i'm either going to have my injectors cleaned or try some working ones first to be sure.
A cave-man style of what I want to call 'waking up' stuck injectors is by sending short bursts of direct 12V on their socket. Just give it some short bursts until you hear the injectors mechanical 'click' for every burst of 12V. I do this by removing the sockets and carefully run 2 wires from an external 12V battery to an injector socket I made with one of the wires open. Sliding the 2 sides of the open wire gives it the 'burst' I'm talking about. Just make sure there is no fuel on the rail / around the intake manifold. If this doesn't work, then you can take the injectors to a professional service center. It's still always worth a try. I've had alot of injectors from the scrapyard that were deemed dead but woke up with this technique that was used by cavemen...