hi, i have a 87 mustang gt and it is running very rich, i cant figure out why. It ran finr until i did a cold air intake and then headers and just a h-pipe. I was worried about the engine maybe running a little lean because of the intake but i am definitely surprised its rich. How can i fix this???? I should also add that the o2 sensors are plugged in so thats not an issue any help would be very appreciated.