Im having a funky little problem with idle AFR and not sure if its a slow or lazy 02 or something else.Daily i will come to a stop and the car will bounce from 14.5 to 15.7 at idle then all of a sudden go to 12.5 and for sometimes for 5-10 seconds(no surging).Wide open AFR and cruise are still dead on but at idle this problem shows its ugly head.I don't log unfortunately but was wondering if anyone else has had this problem.Thanks for any input beforehand

 

GSC s2 cams on stock 10.5 turbo(gsc titanium springs and retainers)
muse 02 dump
walbro fuel pump
buschur bullet TBE
stock injectors
ets licp and stock uicp
3inch ets intercooler
hallmann mbc
omni 4bar map on ets SD intake
-knN filter

Car is tuned and makes 371/368tq and it doesn't idle like **** just noticed it swinging to rich at a light and thought something could be wrong.No surging and plugs have been changed recently and gapped correctly

 

The bounce is normal, especially with that TBE and the cams. When it goes to 12.5 AFR is the car reving up?

 

Yes you can hear the idle raise just a bit

 

My evo does the same thing. You're fine bro. I especially like when I'm at a light and people are in the crosswalk and the evo revs up on it's own. They look at me like I'm a maniac.

 

Had this issue but I'm on stock cams. Found out it was a vaccum leak.