Need help!! got this 320d, starts and runs fine but on the road it's flat as a fart. No fault codes and live data is good, requested boost vs actual boost = 2000, requested rail pressure vs actual was ok, the only thing that is wrong is the MAF output which is showing half of that requested, in the workshop it scopes at 3.5v max. Now I know this is probably the problem but I've tried a new bosch unit and it's exactly the same and there is no restrictions anywhere, and will only rev to 3500 rpm. Any ideas anyone?