One problem related to crankcase (pcv) has been reported for the 2004 Chevrolet Silverado. The most recently reported issues are listed below.
Driving down the highway, and a piece of pvc pipe went into the front of the gas tank and then most of the way out. Right now, there are approximately 15 pounds of pvc pipe stuck in the tank. The aluminum cover only covers the back and the side of the gas tank.