[V8] exhaust soot

[allanvega at adelphia.net]

I thought this was related to my bad o2 sensor. but now suspect not. My left tail pipe is clean when compared to the right side tail pipe. It is my belief that the right tail pipe corespondes to left head and vise versa. Now, our v8s use only one o2 sensor. If bad, wouldnt both sides exhibit a soot problem? So my question is this: What would cause only half my exhaust to be running rich? Allan