Car bogs and breaks up when going to closed loop

[Paul Workman]

Originally Posted by LGAFF

I think my problem is solved, I kept looking at the DS o2. and after watching another cars 02s oscillate I noticed it was the PS behavior that was different. pulled the harness extension, rebuilt it and looks like my issues are no longer..... need to do some additional testing

Cold solder joint mebby? The intermittent nature of them can make for a bitch of a time to troubleshoot!