I've had and still do have a similar problem.
Keep and eye and an ear on it dyswtric27, I bet it comes back.
When I bought my car (already turboed and tec'd) he was still running the Champions (W.T.F?) I changed out the plugs and it ran great!
Now it is doing it again. I know that I am running rich, but I am still too timid to pull back some fuel. I guess I'll have to take the risk!