Ok so I had a search around. The turbo inlet hose had a rip right on the hose clamp on the turbo housing end so I replaced that with a new tomei one. That didn't fix it at all really (even though it had to be replaced anyway) I read the codes and its only throwing P0159 idle air system performance. We had another search around and whilst cleaning and checking the IACV I found that the motor has seized/died or whatever. Manually held the valve in place and idle returned to normal. So I just need to grab a replacement when I get a chance.