FiTech is sending me a software update to try first with better algorithms etc..
Tech also said it sounds like it could be O2 sensor which is a factory GM part so if thats it it should be a quick fix.
We shall see.
Hey Hometeam or Sauto have you ever heard of the Coffeyville Street Races? I went last weekend to watch a buddy of mine race. Pretty good event with some real quick cars.