There are a few things that you can check by yourself:
The easiest is to check if you have a stuffy tank by: disconnecting the main hose from the fuel filter and take out the tank cap; then blow some compressed air in the hose until you hear bubbles noise from the tank. This way you'll manage to temporary (some hundreds miles) clear your hoses from any dirt or deposits that might obstruct your fuel lines.
Next thing is to check the turbo actuator. There should be a shiny portion about 5-7mm on the actuator's rod. If there isn't this shiny portion this usually means trouble with the turbo, actuator or air lines which are going to turbo or IC.
I had trouble like yours when my fuel tank was stuffy, but also when my turbo died (which cost me a lot of money).
Other thing you might check is the EGR (if you have).
You might check the injection pump also (like Chesh told you). There is a special tool that can check the parameters of your pump.
Injection pumps are strong; I drive pure biodiesel, cooking oil and engine oil at about 300k km and works perfect... but who knows.
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