above 3k... hesitation and choking

[miucus]

hey, just got my s14 sr20det swaped into my s13 today.
while driving home today, the engine started to hesitate/choke and shake violently when going above 3k rpm in every gear. seems like the fuel is getting cut off or something. the engine idles fine though. im a newbie when it comes to problems so please help me out.

mods
greddy turbo pipe and downpipe
greddy intake
stock exhaust =/
stock fuel pump =/ replacing soon but can this be a problem?

thanks for the help