How about some outside perspective. No idea about this engine though.
You havent specified if your checked the spark plugs them selves.
Normally in this case with my older nissan engines we run a crank angle test and then a spark test by seeing if a spark arks onto the chassis from a lose coil pack. Most of the older coil packs I use have a bit of .. conductive material I dont know what it is at the end of them. Often they crack or disintegrate. If the coil packs are ehem, double sided, then one may not be conducting properly on one side. A soft spark will cause a misfire.
"Dying 's for fools ... ... Because, because I'm a man." - Charlie Sheen
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