I am finally plowing some snow here in the Northeast. The 2320 with the 54" blade does a great job, although a bigger plow would be good. I have been hearing a "Rattling, Vibrating," noise underneath when I first start the 2320. It is not the hood latch, I dampened that with electrical tape. Also I am not talking about the engine itself being noisy from the cold when it first fires. Has anyone a clue?