It's a Pectel T2 ecu piggybacked to a factory ecu. I was thinking sensor related tbh. When the car accelerates with WOT in 3rd, 4th or 5th, it will get to about 3000rpm to about 5000rpm then shudders and loses acceleration. Can manage to drive to redline with less throttle though. It has like a jet engine type wooshing popping noise from the exhaust. Not loud but can be heard inside but nothing unusual from exhaust while doing it. But I've unplugged lambda, maf, act individually and get no EML and seems to make no difference to how car drives. It did have a crap breather system which I've replaced with a catch tank with atmos venting. Still have mustardy sludge coming out though. Also car had pistons and turbo rebuild a few years back and not used much since til I bought it.