How do I test non-firing cylinders?
 

How do I test non-firing cylinders? I have a 1975 johnson 70hp engine
that is not firing on two of its 3 cylinders. The non firing plugs
seem to be geting wet so there is fuel to them. Could it be two bad
coils and how do I test them? Any step down trouble shooting methods
would be greatly appreciated for a novice like myself.