I would say check the fast idle cam as well, if it aint been put on properly it revs like shit ( i know because I stuffed up when i rebuild my mates carby on his Mav ), as for the miss fire.. do the norm.. switch the leads around, and the pugs.. then look for more serious stuff, i have in the past had leads that miss fire when an engine is cold yet the are fine when it warms up
check the GQ BIBLES http://www.nissanpatrol.com.au/forum...atrol-Software they have a really good exploded image of the carby and how it should all go together