After being stood for a while my van would go into limp mode if revved above 3k. It lasted a couple of days and i didnt have a problem after that but it was in daily use. Its been stood again for a couple of weeks and it's doing the same thing again.. I've heard that this could be down to the actuator arm on the turbo? If it is this can you resolve it somehow while the turbo is on or is it a turbo off job?