Alright so a few days ago I noticed when driving the SE that it would get surges where the RPMS would bounce a bit, in motion and at idle. Turn the car off and then back on and it would releave it for a few miles. I got an SES light and 2 things came up
1. Multiple cylinder misfire
2. o2 bank 2 low voltage
When I got back to the house I erased the codes after checking wire connections and spark. Took it back out where the problem persisted. This time only getting one code
1. Cylinder 4 misfire.
This time I took the plug out and put in another that I had as a spare just to see if that really was the issue. Well sure enough the problem continues with the same code(s) coming up each time. I haven't seen the o2 code since that one time though, but is it a possibility that it is what's causing the issue? I mean with the tune it does run rich and would make sense if it went bad. Or maybe the cat? Has almost 300k miles on it and with it running rich since the swap maybe have done it in. I have spares of both things but don't want to bother if no one thinks that's the issue. Let me know what you guys think and i'll def look into it
