If your getting the 17705 fault code and power cut, and you have checked the pcv system and boost pipes then there is a very good chance there is not fault with the car at all. There is a software bug in the stock mapping which causes the 17705 code to keep popping up. The fault related to a load factor off set based on engine rpm, maf reading, air temp, water temp ect the deviation allowance is very low only a certain temps which can trigger the fault for no reason.
This can easy be mapped out in the stock mapping or the remap code.