boost_its_what_for_dinner

my turbo spools up fine and will hold boost but it does do anything while in boost but cut in and out after 4k rpms i thought it was an air leak on after the afm in front of the turbo but i fixed that and now it still does and its bs oh and it will rev to redline out of boost and out of gear so the secondaries have to be working in order to redline right ? but lets see i have no filter on the afm and i have three inch exhaust from the factory downpipe and an aftermarket a/f and boost gauge if that helps