My 4x4 saff has started idling very rough going up and down between about 300 and 1600 rpm and sometimes comes down far enough to cut out, it also missing in midrange but ok low down the revs.
Any ideas what I can check that might be casuing it pretty sure its not plugs as I just fitted a new set of 071's and thought it might be them so then fitted a new set of champion 59's which is what was in before but its still the same.

Thanks in advance for any advice.