problems after header install
i installed long tubes and a TSP catted y on my car about a month ago, i finally got home and welded it all up this weekend and now the car isnt running that good. When i ran it a month ago right after i installed the headers the car ran fine, didnt have o2 simms at the time and it still ran fine no ses light or anything. now i put the simms in and the car is running terribly, very choppy idle and it surges, it got better after i drove it, not as choppy but it still surges, it will idle normally and then every minute or so it surges to like 2500 rpms and then drops itself back down again. I know the car probably wont run perfect without a proper tune but i didnt expect this, any thoughts....? i also dont know if this makes a difference but i figure ill throw it out there anyway....is there a difference between the front and rear o2 sensors, because i didnt keep them separated after taking them off, so there may be one front and one rear on the headers if there is even a difference between them, any help would be great, thanks in advance, Paul