When i start my 1.9TDi "not PD" there is a power big power loss. When you rev the engine to 3100 Rpm the power drops off. and then seem to limit the power output. But if you turn the engine off and then back on, the power returns and remains even when you tern the engine off. But if you leave the engine off for a period of grater than 2 hour the fault returns any ideas how to solve this.
Many Thanks David