peterpan

hi to all you member, i recently bought myself my first impreza, 95 wrx import, about a month down the line i got a v.loud squeel from under the bonnet, i later discovered it was a loose bolt in the dump valve, this unfortunatly was after i had taken all the hoses from intercooler and turbo off, since replaceing the hoses i have notice that i have gone from approx 10 psi down to approx 7, and i dont know if this has anything to do with that but every now and again the engine revs just drop and it cuts out when i press the clutch, if anyone can help or has any info which could help please reply, thanks