Thanks Haz and Tommy, I appreciate the replies.

As Haz said, it's an MFi so it doesnt have ISCV

I've given the car a complete check over and found a split breather pipe but it really doesnt make any difference to the running, I did get a shock off the HT lead though so I am thinking maybe it's getting a weak spark.

Took the cylinder on air box off and couldn't blow through, is that right? And how would I go about testing it?
Also how can I adjust the fuel mixture?
(Timing is bang on by the way, nothing wrong in that respect)

Thanks - Travis