Ive just put the 2.8L Pacesetter Headers on my 3.1L. The Air pump is not hooked up now. My car stalls out when the car is fully warm when i am decceling. Computer says that the o2 circut is staying open. Got any ideas on why this is happening and what I can do to fix this. Seems that the o2 is not getting warm enough to close. On the car is also a thunderbolt highflow cat and flowmaster 80 series cat back.

I am sorry if theres another thread about this but i just need to address my problem. Thanks