I have a '98 WS6 with open headers, and my stock stall won't lock up always...so my car will idle fine on start up, but after i drive it, at lights and stuff it will idle at like 400 and want to stall. What's wrong with it?

I have been running open headers for 2 months and never had this problem until 2 days ago.

 

you've probably finally burnt the o2s out....at start up and running your not using them as much....but when you come to stops they are switching back and forth pretty fast, you have techincally a HUGE exhaust leak right off the collector...any leak with in 9-12 inchs of a o2 will be picked up....

 

Thank you! I have a set of handmade truduals which I am installing wednesday, so that should fix it I guess. Should I replace my o2's?