Check the point gap, could be the points are closed up, not enough gap.
Pull one plug wire at a time running, see which cylinders are firing, which are not. Check for spark at the plug end of the wires that make no difference when pulled. Should get a blue hot spark that will jump 1/4" or more at the plug end of each wire.
Check for fouled plugs, crossed wires, carbon tracked cap, water under the cap, bad wires.
Check the compression. If adjoining cylinders are low, could be the head gasket blown between cylinders. Look the valve train over for broken valve springs, bent pushrod, intake valve not opening. Check the valve lash adjustment.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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