Boost and running rich issues

I have a 2009 Mazdaspeed 3 that is currently making me pull my hair out. On throttle the car will build boost till around 4K to 5k ish and either cut or hesitate boost then resume.

I have currently checked all my tubes and rebuilt my fmic to make sure there were good seals on the tubes. I do need to boost leak test. Checked the timing chain, it’s nice and tight no slop.


- New MAF sensor

- stretched ignition coil springs

- added fuel system cleaner


The car idles very strong never see it dip or rise. I do notice when coming to a stop the rpms will dip down really low and on one occasion the car died. The car also does suck gas like crazy.


Video of issue:



End of video the car dies on slowdown to my drive way.


Video of idle:




Mods:

Currently I have just put in ngk 1 step colder plugs gapped correctly.

The car has a injen intake, it’s straight piped, and a front mounted intercooler... and unfortunately a HKS ssqv bov I know MS3’s require recirculating the adapter is coming.


Codes:

P0139 prolly from straight pipe.

P2188 which is rich at idle bank 1, the downpipe has a small crack which is why I’m sure it’s running rich going to weld it tmr but I’m not sure it’s the cause of the boost issues .

 

Sounds like it was tuned on a different intake and/or turbo. Get logs, post them (both idle and wot). Log everything for now if using AP.