Too Low of Idle after Boosting

[murcielago]

Hello Tuners,

Wlel i'm having a bit of problem, when im coming to a stop after boosting.. and slowing down, with foot on clutch the rpms go very low, close to 200rpm, this only happens after boosting.. and the car lays on lean side, and then it slowly adjusts it self back to around 14.7, and boost gauge to 20-on vaccum side...

Any idea why this may be happening?

i have the following mods:
255 walbro fp, afpr set at 43psi with vaccum line off-and sits at 40 at idle...

Just need to know why the rpms drop so much is like the vcar its about to stall but just doesnt, and it does this only after boosting a bit..

Well Thank you in advance, and please good inputs..

 

[LiquidX]

Well first thing you can do is a through boost leak test.

 

[Janaelen]

I 2nd the Boost Leak Test. If all checks out well, it might be a weak or faulty IACV.

I had the same issue on 2 different GSTs, one was a boost leak, the other was a faulty IACV that checked out on a voltmeter but the failed the battery test (watching the pintle move back and forth smoothly).

 

[murcielago]

I figured out the problem!, my BOV recirculating hose was cut open, complete leaking out the recirculating air..

Thanks to everyone for their help.