Car cuts out and stumbles when starts to hit boost

[Turbo317]

I recently put alot of new upgrapgrades on my car over winter. and im currently driving in around a little bit with just the THDP on the exhaust. But my question is, when i start to get on it at 1st it just wants to go, but the boost starts to pic up and starts to a little more but then it starts to stumble and dies out, and i can get no more than maybe 5 lbs of boost going before it stumbles. i put a new maf on last fall, fpr was a 42 last time i checked, tps at .46 .. any ideas on why it stumble?? would the computer need a certain amount of running time to relearn with all my upgrades??
thanks,
Bryan

 

[sixgun86gn]

My car only needs about 20 minutes or so driving time to relearn.I think it could be ignition related.What about a cat,are you running one.Mine also did this when I got it.The cat was clogged.When I removed it my car spooled like mad.before it would only get 10# with the wastegate all the way in!

 

[Turbo317]

i am not running a cat, and i will go check the wires and ignition soon
thanks

 

[idaho gn]

fuel pump

 

[SuperSix]

Check to see if the passenger side exhaust header is hitting/shorting out on the positive battery cable..

 

[Steve Wood]

check your coil pack.

 

[svtnos]

my GN is doing the same thing. im going to test the coil pack this weekend.... buying a new fuel pump this weekend too i cant describe how much of love the GN