my car just recently started having a wierd idle issue. it will idle fine when started but after running for a minute it starts idling like it has a vacuum leak, but ive checked everything and there is no leak i also noticed the wideband reading changes drastically when it does this. the ONLY thing that got changed was moving where the ground off of the battery was bolted. would it be possible that is whats causing the issue? heres a quick video of what its doing. it still does it at partial throttle but at WOT it holds right where it needs to be as far as A/F goes.

 

Anybody have any suggestions/advice? I would put the ground back where it was but there's a passenger seat in the way lol