can anyone help just got my brothers impreza running took it out for a run around block fine got back and previously major oil leak from oil feed turbo onto up pipe so my brother jet sprayed it to get the worst off car went divvy would'nt rev but would idle it seemed to cut out when we tried to rev after about 5 mins we turned it off and re-started fine would rev took it out for a run NO BOOST flat as a fart after 3 runs and various tinkering got very slight boost but only real slight minimal boost the boost is soooo low there is no dumping from the dump valve anyone got ant ideas where to start?????

cheers

john