I have Edelbrok headers designed to replace the stock manifold. I was thinking that the O2 was cooling off too. Is that common? It happened when the car was idling at normal speeds. Can you recommend a heated replacement? (year, model, etc) I was thinking about doing that anyways because I can get the car in closed loop quicker. I understand there different types of O2 sensors, one I have heard of is a wide band O2 sensor. Not knowing the difference, I have been hesitant to change it. Thanks.