ISC, Boost leak, Plugs?

[Sparky2211]

So i have been searching for days now to try to fix a problem on a car that i just got. Heres the issue.

I can drive the car while it is cold and it is fine with no stalling and really it runs great! but after it warms up, when i come to a stop (Push the clutch in) the cars RPM will drop off to 100-300 RPM or it will just die.

There is nothing done to the car at all. It is completely stock with NO modifications at all. What do you think the problem could be. i have been looking on Vfaq for different ideas on what the problem could be. All i know right now is that it could be a vac leak, ISC, Boost leak, Bad BISS setting. What do you think?

BTW: the Car is a 90 Talon TSI AWD