I have an '04 3500 Siverado with 6.6L Turbo Diesel. The problem is the turbo charger is not showing any boost. The truck is equipped with a boost gauge, so not only can I see no boost pressure, I can certainly feel the truck is down on power. This problem has occurred twice in the last couple of weeks. It has been quite cold (-20C or -4F) lately and this may be the cause. But I'm wondering if anyone else has seen this problem?