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I went to test drive an STi yesterday which had a broken speedo cable and was apprently making the fuel cut off, cut in
So when he booted it, it would cut out after 4-5k rpm
In the classic shaped imprezas if something is wrong with the cable it limits to about 4500rpm and lowers the boost as the ecu is reading it as a fault.
Just replace the cable and it should be fine.
As said in your duplicate post if someone is selling a car like that what else is wrong with it.
There are so many imprezas up for sale you are really spoilt for choice.
Look in the 'For Sale' section on here or pistonheads.