hey all,
i got some problems with the wrx

check engine light came on yesterday, and wen i pulleed over it just died. waited a while i started with no engine light on..
it started revving at 2.5 thou at the lights for no reason, and it also revvs up and down from 0.5 to 1.5 after going and stopping suiddenly eg red lights.

from experience does this sound like a fule pump?? or something similar, what is my best option getting it sorted out.

thanks