[JNJchev77]

It is DBC. I looked at my old TB, which was the original TB for this engine and it is a DBW. The blade is slightly open as you stated.

Yes, it always does this, however, as you mentioned about the battery, I unhook it almost all the time as I have a load that's draining the battery when truck is off and haven't tracked it down yet. I believe it is my air compressors, but just haven't made it a priority to find out where it's coming from... until now!

I tried adjusting the set screw for the blade and it's doing the same thing, so I reset it back to it's original height.

I've also noticed some TB's have a hole drilled in them...? Mine doesn't have one, which I'm going to assume doesn't need to be there?