So when Im cruising my a/f is from 14-15. Drives fine. Then when I come to a stop it acts like it wants to stall and starts to idle rough with a/f sunk way lean. Ove 16. And will go back up to 15. It doesn't always do it. When I start it cold it will do the same rich idle. And leans out. I'm not sure where to start. Im going to do a boost leak test and go from there. Just would like some input. Maybe leak in one of injectors? Thank you
2003 Evo 8 105,000 miles tuned to 19psi

 

i had the same probably 10 miles later bye bye piston

 

Don't come back until this is done!

 

Do you have a blow-off valve that doesn't recirculate? That will cause this symptom as well

 

i thought they all did this

 

Well I did my boost leak test and my shaft seals on my throttle body are leaking and my BISS screw was broken in the hole!! So I ended up buying the Mil.spec 65mm ported TB and the problem is gone! I do have an Evo 9 bov the is recirculating