I finally got the headers on my car, and had an exhaust shop hook back up my hooker catback, and now it doesn't run that well at all! When I floor it, it'll pull pretty well, but when I'm crusing, it'll chug alot. I found two exhaust leaks, right after the collectors on the headers. I waited until it was cold, and started it up and it feels like someone is just blowing on your finger. I have no ses light. Are my O2's getting crazy signals and making my car run real rich? My mechanic said it was and it needs to be fixed soon. Also, my exhaust will pop on decel sometimes??