who knows without tearing into it
but maybe you broke #3 exhaust spring and when the cylinder is pumping air down the tailpipe the O2 is tellin the PCM to richen things up???
I would think youd get a definitve code for #3???

 

broken valve spring, hopefully the $5 part solves all my problems

 

it was a spring?

 

Wow!! Go figure, I wonder if this happens alot!? Glad to hear you found the problem thou!!

 

drama continues, the valve is bent too, I imagine the spring broke first. Off with its head

 

ok here is the downlow on what really happened the lifter was stuck I heard the ticking for quite a while but it stuck at the top so it was lifting the valve to much and broke the spring, the valve was not bent just a wrong direction on the diagnostic road. Still had to pull the head to replace the lifter of course.

Thanks for all the help.