ok, i just finished installing my headers, and my car is now running really rough. I took off the air system, but i haven't got a smog delete yet.

Prior to doing this, i had a fully functional egr system. Might I have missed a piece of the system which could be causing it to do this? any help would be appreciated.

I have a mostly stock 305, but the car was running fine prior to header install (with the exception of an exhaust leak)