How do you know - or what do you mean - that it's not firing on those two cylinders?
Did you test for spark at each of the cylinders?
If not - grab an extra spark plug, and just pull each wire one at a time and use the spare plug to see if it's sparking.
If they're not, then you can focus 100% on the distributor.
If it is sparking all around, it doesn't prove things are 100% in the distributor, but good enough that you should move your focus to valves. Adjust the valve lash, and in doing so you should be able to see if any are stuck or not working properly.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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