84 stanza wont start.... help!!!!

it came home fine and in the morning nothing, it cranks and cranks so checked fuel since it was very cold day and fuel is pumping, so then checked spark and no sparkbut it has two coils and eight spark plugs on a simple lil four cyl. so following the book i checked the cap and rotor and replaced them and still no spark so i checked the coils and replaced one and have spark at coils but not plugs. i am confussed by this dual plug system running off one cap and rotor. any help would be greatly appreciated. thanks