Truck was sounding funny on start up with a real loud whap whap whap and shaking not idling normal for a few moments. On the way to work it ran ok just seemed under powered a little bit. After 30 minutes driving it feels like im going fast down a dirt road with even the steering wheel shaking. Turbo is still boosting up it just feels under powered. When holding the brake down and giving power it hesitates and feels under power. Ideas?