boost leak sputting?

[RedWagon]

OK so today I finally was able to get my car started after being down for like 6 months. While on the test drive it was smooth until I get into boost and then it starts sputtering. I didnt know if this is fuel cut, o2 sensor, boost leak or what but I did notice that my BOV vacuum line popped off while driving. Also to note that I still havent changed out my stock fuel system and no EMS as of yet, so I didnt know if I wasnt getting enough fuel. My mod list includes:

Bullseye power Vtrim turbo
megan racing full 3" turboback exhaust
fp intake and exhaust manifold
ebay FMIC
and more I just cant think

Help me decide what fuel mods I need to produce 350hp and what EMS.

 

[1bad91tsi]

I have the exact same problem,I thought it was a boost leak so i redone most of the connections,still no dice
Ive read to put in the bpr6hs ngk plugs(search for the exact ngk #)in and it almost fixed it every time,im doing that tommorrow

 

[Avionixx]

Could definitely be a boost leak. Had very similar symptoms when my stock upper intercooler pipe slid off of the elbow and every time the car went into boost, it would just dump all of it out into the engine bay. Severe sputtering ensued, but I was able to drive out home as long as I stayed in vacuum.