2012 CTS-V no mentionable mods. CAI.

Noticed some sluggish performance a few weeks ago. Turned out the CAI had came loose from the TB. So it was pulling air outside the filter. Fixed that, but still had poor performance.

Did a few test drives but my tech couldn’t find any unusual values on the snap on. O2’s seemed to be okay, jumping around like they should. Fuel trim was a bit lean but nothing serious. However he noticed performance was only sluggish in closed loop. Open loop it pulls just fine.

By by poor performance I mean low rpm wot it just accelerates poor. Unless - it’s in open loop. Which doesn’t always happen. I’m unsure on what condition it’s supposed to happen. So here’s what I’ve changed so far :

new zl1 lid. Suspected maybe the brick was leaking. It wasn’t. Oh well.

New plugs -
new maf - acdelco
new wires
new knock sensors
new o2’s upstream and downstream NTK
new temp sensor in the lid

car has a few misfires on all cylinders - but nothing persistent. I’m talking like 2 maximum 4 randomly on random cylinders. No cel.

65K miles

any ideas, pointers ? Could it be the tps or the tb ?