Yea, was going to mention that but was focused on the vibration. I have to clean my IAC about once a year. I usually just doing it when I clean my K&N since I am in there anyway. I know the autos are a little rougher and could be the tranny mount or even the torque converter causing. Just as a follow up, if you are using a lot more fuel then it is probably learning. I dropped about 5mpg, it was like running e-85 mileage.