I recently bought a 2003 Jetta Diesel 5-speed. Ever since I bought it there has been a check engine light. I finally got around to putting it on my machine and the code that pops up is P0299 and that says it has a turbo underboost. The problem i'm experiencing is loss of power. After 3k RPM, i feel that there is no boost. Other times at 3K RPM there is a lot of boost and I can feel it. What can I inspect for possible trouble areas? Any suggestions would be appreciated!