I'm sure you remembered in your project that it's important that the o2 sensors read the appropriate banks. (i.e. Cyl 1-3 and 4-6, Bank 1 and Bank 2 Respectively). If you mate the o2 sensors all in 1 bank it will likely cause drivability problems. So be sure to mate the o2 sensors in a good location that read 1-3 separate from 4-6 cylinders.