Maestro Turbo not boosting past 3750 rpm

[Jeff Turbo]

Hi Jeff, Thanks and no I've not checked them too.
The air temp is only part of the choke/stepper motor I think so probably not that. Is there deffo an accelerator pedal switch?

Yes there is, look in the drivers foot well. As I assumed you changed everything else, these are the only things left without testing the pressure etc and actuator