Poor idle after engine braking, OFT
 

I'm getting a really rough idle , sometimes to the point where my car is just dying while trying to idle. It's most prevalent if I'm getting off the interstate and engine brake on the off ramp.


I can try to get some logs here soon...but is anyone having something similar?


I'm running:
2013 BRZ
OFT Stage 2+ (whatever the latest as of 12/2019 was)
Invidia catless front pipe + Q300
OpenFlash headers
~70k miles

What are fuel trims like? Sounds like vacuum leak

Last I checked +/- ~5%? I'll grab a log tomorrow.


How could I check for vacuum leaks on this guy? I'm used to working on older cars. This thing spun a rod bearing at ~57k and I got a new short block. Then had the valve spring recall done. I don't remember this being an issue before the recall so it's entirely possible something just isn't sealed up.

Log Boost with oft its manifold pressure reliative to atmospheric

at idle should be about -10 psi


check fuel trims at idle are less than 10%


check DI computer has all three mount bolts in and tight



if ok bump idle 50 or 100 rpm
adjist overun fuel resume to cut in 100 or 150 rpm sooner