i've just done an engine swap, na to j-spec turbo.it starts and idles find but as soon as i rev it pass 3000 rpm it cuts out. if i rev when i just start the car it will rev pass 3 gran. does anybody know wats going on. i've already changed the fuel pump.

 

Is that reving in neutral or when you're driving?

 

sounds like an ecu problem or perhaps a wiring issue.....is it an s4 or s5