Problem 1. A faulty coolant or fuel temp sensor can cause a pd to rev up when started ( normally a check light on dash ) Problem 2. If you do get the fault memory checked there will be a fault regarding boost pressure regulation, the ecu knows the boost pressure is not within the range that it should be at that given rpm/load. It could be a number of things from a split vac pipe,boost pressure control valve or it could even be a faulty turbo (sticky vnt)