car is running normal; but when i WOT (wide open throttle) it i mean rev it hard it dies after or at 4000 rpm and when i dissconnect all the boost pipes i mean run the engine without boost going in then it revs fine ........ also if gas pedal is pressed like slowly it goes fine but not as it used too please let me know what to check and what might or possibly be wrong ... shoot me a list il see everything what can be the cause !!

how much boost are you generating at wot....

tps?

Does it DIE die? Or just go then decelerate really hard, then go more, etc. Because if it's going and feeling like your loosing all throttle, but the engine doesn't feel rough, and if you keep your foot in it, it recovers for awhile then slows again, you probably are hitting the boost cut. Happens to me with minor bolt ons - CB, DP, Intake.

mods?

I am having a similar problem... what could the problem be.. how do i check if it is a bad TPS??

could be a bad cat converter. do you have a down pipe?