Thanks Mark. I cleaned the MAF again, and bumped into BA in the process at super cheap as I ran out of maf cleaner.
Pretty sure it's now sorted its self, I just re-tuned dawes and needled valves from scratch. Let's see if she holds now.
I had to pick up something right next to Mr nissan this arvo, and while I was waiting I thought I'd pop in and ask what they thought.
Guy I spoke to said it's got to be fuel related. Filter or even injector pump. Then as I was driving away from there it actually occured to me I did fill up yesterday afternoon after it started being a slug, and both tanks were nearly empty, so it may have picked up crap from bottom of the tanks. Maybe I'm just thinking too deep into this.
Anyways lets see how she goes now ...