Recently got hooker long tubes installed and at the same time 02 and extensions..after this my check engine light came on..i have a leak i believe on the passenger side on headers and just need a new gasket..my codes got scanned and it came up that one of the 02's was leaning out..at idol it was now getting enough and at higher rpms it was a little bit better..clynders 4 and 7 were also missfiring at times..would this probably be from a leak in one of the headers? thanks alot

 

The misfire is most likely a burnt plug wire. An exhaust leak will sound like a loud ticking. Ride with your windows up and see if you can hear it.

 

i changed the plugs and wires when the headers were being done..when hooked up to a computer the missfire was only occuring at idoling..

 

Both an exhaust leak before the O2 sensor, and misfires will cause the O2 content in the exhaust to rise, and the O2 sensor will report a "false" lean condition. The result is the PCM richening up the mixture, and now the entire bank is running rich. Fix the exhaust leak. Track down the misfire - plug could have cracked when being installed, gap might be wrong, wires could be burned, wire (or terminal on plug) could be loose..... lot's of things.

 

okay i'll check the wires..i was wondering if it was just from the exhaust leak thou.....