check error codes.
how does it idle? if the idle is shitty try unplugging the AFM. if the idle smooths out, that, along with the problem you have described would lead me to believe that the AFM is shot.
on the head that came with my 89+ (dont know year) jdm gte motor i was able to get the washers in place with the studs installed.
with my 86.5 head on my gte motor i had to put the washers inplace BEFORE i threaded in the studs.
and the size for the nuts is 9/16.
i usually...
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