Does anyohw know where to find a good "how to" on cleaning out the port? I think that possibly the problem might actually be the EGR valve itself as the car has started to make a strange noise whenver you turn it off, it used to be a small rush of air sound now it's a muffled groaning sound. So I'm thinking maybe the valve itself is bad or perhaps it's just sticking and dirty. I don't know where this valve is located so if anyone could help me out it would be greatly appreciated.

Thanks in advance!