I noticed at wide open throttle one time I was getting about a 12-1 on the O2 sensor. Again I didn't have the O2 sensor shorted out at that time. But I do believe I have it now. if that's the case then I would like those secondary doors to open a little more and allow a little more air. Again I called the Holley tech line this morning and then again going to send me a a set and they usually take about a week so probably next Thursday again...