I just got a set of Racing Dynamics headers. They came off a 325i and went on my 325i. I got new gaskits and bulted it up. I have driven the car to work the next day and when I got to a red light the idle was all over the place and the car almost stalled. I looked at my vac gadge and it was at about 15-16. I am wondering 3 things could it be the O2 sensor, car ajusting to new airflow, or a vac leak some where or the AFM. The car ran fine before the headers and actuly had headers on it before The RD ones. any idea
