hey, i just installed a set of pacesetter long tubes and now the car has a bad low rpm studder and backfire. it use to fine when the car was cold, then it woulod run like **** when it warmed up. but now it just runs like crap.

what could this be? burnt up 02 sensor, i found one stuck to my header so i pulled it off seemed to be fine on the outside. by the way im running open headers. do i need to have my rear 02's deleted? or the last thing i could think of is a burnt wire? well i just wanted to get some opinions on what you guys think it could be.

 

Have your rear o2s deleted, and it wont run great on open headers because the O2 readings will be saturated with outside air, causing it to run very rich.

 

The Rear O2's don't have any effect on how the car runs. They only say if the cat is there and working. I would get some sims or programming so you won't have an SES on them. Also running open header isn't the best idea either. It could be part of or all of your problem. I would suspect a burnt plug wire maybe the culprit too. Your car doesn't rely on the O2's until after its warmed up. So if it runs like crap on start up it can't be O2' related.

 

I'd check the plugs/wires first. Also open headers aren't that great, the knock sensor is gonna pick up alot of false knocks. And put your catback on