Hello everyone. I'm new to this forum. I am having serious trouble with my Subaru B4 Twin Turbo Legacy. I bought it 2 years ago and it never had full power. Only got around to looking at it now. I'm not very mechanical so I do get a guy to look. I will tell you what has happened since I have it. First check engine light came on it was the Knock senser so changed that. (New one) then after a bit the engine light came on and it couldn't idle. Airflow meter was the issue so changed that. (New one) then the first turbo blew on it so put a second hand one in that had no play. Still had lack of power. From 100 up she will move better. I have vaccum and compression. I also put new spark plugs in it and took ignition coils out of my wrx and put it into it and still has lack of power. Anyone ever had my problem that can help??
Thanks in advance

 

Legacy forum would be a better place to start but the black box of death would be my first place to look.