johnboyxxl

I am having a misfire when the car is started when cold. It seams to go away once engine is warmed up and runs much better. It now stays in 8 cylinder mode all time. I had engine codes read and one was 02 sensor another about emissions I will have to get them pulled again to know the numbers. I installed new plugs with no change. I would appreciate any help on this. Thanks

blkchevyz

probably a bad o2 sensor if its throwing a code.