Ca18det Help/Wtb 18det maf

[nismo_200sx]

my ca runs and idles ok no rough idling as long as i keep the throttle on but not exceeding 50% if i give it anything above 50% throttle it pops and sounds like its bogging out and then dies if i dont go back to 50% or less throttle. it also idles fine but then dies out after 20-30 seconds after being on with 0% throttle. it wont die if i keep the throttle on so i was thinking it could be a bad o2 sensor/maf/tps. i checked for vacuum leaks and boost leaks but i dont have any. my car wont get into boost at all once i get to 0 vacuum on the boost gauge it wont rev any higher it sounds like it has 2 step from the popping and stuff. i was wondering what i need to buy? i dont have too much money maybe 100 bucks to spend