I recently purchased a used 1998 bug with 143,000 miles and the powerband seems to be between 2 and 3 thousand RPM's. the engine just seems very sluggish, after 3,000 rpm's the engine doesn't pull any more just revs. I took it to the shop and they said the diagnostic was "Intake Manifold pressure Control difference-Intermittent" and the fuel shut off valve was malfunctioning. They said it would cost $300 to $400 to repair, because of the labor intensiveness of cleaning out the carbon from the intake manifold. The shop specializes in Vw and audi's so I trust what they are saying. They also said there was a problem with the waste gate, so I know there is something wrong but I don't want to shell out $400 if there is another way to fix it. The power seems to be intermittent, or dependent on temperature, when I first start up the engine and go, I get power all the way to redline and then when I go up a hill or the RPM's drop the car seems to cut off the power at 2,500 rpms. any ideas??