Hi to the Pro's on here,

I Need your help.

Now, that the winter is almost over and the Legnum is about to hit the roads again, I still have to deal with one issue which I did not fix last year. The car developed a leaning out issue. I also remember @foxdie assuming that I might have a small boost leak while he was mapping my car. However, what I am looking for is some advice, on which points to look at.

The issue:
- car leans out to 19ish AFR's when warm idling and during driving when lift off accelerator pedal completely
- when pressing the accelerator pedal on idle (stationary) slightly, revs go up and AFR's go to 16ish before going back to 17ish to 19ish
- while driving when AFRs are lean car seems to take a "second" before AFR's are getting back to normal values
- when under boost and accelerating, car runs fine with stable 11.5 AFR's (as mapped by @foxdie)

The car developed this issue on the way to the mapping Event (so before car was mapped!). The 600kms before after Manual gearbox swap it ran just fine.

So, what to you think guys?
- ICV to be cleaned and checked (plus install new base idle screw and seal)
- boost leak test to be done
- TPS Setting to be checked

Anything else I need to check for? Thanks for your input.