I adjusted the valves and replaced the spark plugs. I ran a datalog and i am getting lean readings on 80% of the cells and before this it was looking pretty good all over. I figure it was something i did during this but can't figure it out. Does anyone have an idea what to check? I did the running engine method so i believe i did it right.

 

Does it only have the problem in closed loop?
What are the O2 readings and fuel trims once it goes into closed loop?

 

I have the the opposite problem...my car is runnning rich, what is the best way to fix this? I anm just your average DIY guy.