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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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