Im going to cheak again for air leak and get a new iscv no point getting secound hand one because it cud do the same but iv got to have my engine cheak because sum one said there is oil in the top of spark plugs but it cud of bin when iv filled it up but it does seem to b lacking power so im going to take spark plugs out and clean them and see if it happens again dnt want it to b head gasket because thats loads if money to have done