18-06-13, 07:10 PM
Had a similar problem a few months ago. #1 zorts was not getting as hot as the others. Checked the plug and had not bad spark. Turned out that it was a dodgey plug that would break down as I gave it the beans but ok if I nursed it. I know you have changed the plugs but you get bad ones. Have you tested the headers to see if any are not as hot as the rest ?
Can't get lost if you don't care where you are