Thanks fella's.

I had posted in the Technical Section about the problem ive got, and received lots of things to try. One of which was the question 'Does it do it off boost'

And it doesn't.... so thought i'd see what happened if i ran it up (Axle stands) to get to the problem rev area, then if it started misfiring i could then start checking various things...

But it didn't misfire...

Thanks fella's i'll have to try a road test now...