Driving it off the cliff

[blue62]

Originally Posted by Stl-986

Just had a better look at the plugs. Makes no sense. 1-3 look good/normal to me. #4 though looks almost new.

Yes....made sure I am working on the correct sides.
1-3 being passenger, 4-6 being driver.

They look about right considering random misfires on bank one.
Shows that they are firing most times.

I was just looking at the fuel trim data you posted in post #2 I saw something odd.
If I am reading it correctly RKAT is the idle range.
FRA is upper idle to mid range RPM..
Data is showing around 700 RPM
So looking at fuel trim I would expect to see positive fuel trim (RKAT idle range) for the bank with the misfires.
But you have a negative fuel trim for bank 1
and a very strong positive fuel trim for bank 2
Bank 2 trim should be very near 1 for trim it is at 3.42
Is there any possibility that the bank1 and bank2 pre cat O2sensor wires are crossed???