I've got this very loud ratteling noise when I accelerate. When I let off the gas, it goes away. It sounds like something is dragging. Someone said it could be the heat shield being loose, but we checked it and it is fine.

Any suggestions?

 

Does it sound like a metal shaving sound? Mine has this and I cant figure it out.

 

Truck is fixed. It ended up being a vacumn hose going to some type of solonoid. Cost to fix was $150. I'll tell you, it sure didn't sound like a hose. It was extremely loud and sounded like my muffler was dragging.