Reference this thread for my setup and history
https://forum.efilive.com/showthread...ics&highlight=

I've got the tune pretty much down pat, cold start is great, idles great, A/F is good, timing is where I want it. But for the life of me when I try to go closed loop all it wants to do is pull fuel at idle and cruise, somewhere in the neighborhood of 10%. With longtubes and mods I usually see it trying to dump a bunch of fuel when you go closed loop. Has anyone seen what Im seeing, that it will trying to lean it out with closed loop? Is it just a matter of adjusting the O2 switch points to something high like 5-600mV to get it to richen up the idle and cruise when in closed loop? Thanks for any info.