ok reset the throttle pot back to how it was (luckily, i had an old map saved, and i could work out from that what the exact voltage was on it before) and it runs MUCH better.

it's still a litle bit lean on some low throttle openings, ocasionally going as high as about 17, but i think thats just down to the mapping (im still on a base map by the way) i'm happy to leave it till dave walker sees it on monday