What do I do about a dead cylinder
You fix it. On these -73 model Civics, many things can go wrong. Come on, You need to give us a little more information.
Now that’s a pretty general question 
… lol … hmmm … well one thing is certain, it’s dead for a reason, so you are most likely looking at
- no spark
- no gas
- no compression
First thing a shop would do is a visual check for a spark at the spark plug during cranking.
Define dead. Lack of compression is the most serious of the lot.
If it is just a “bad” cylinder you punish it, maybe with a restriction of some kind or no dessert for a week. But if it is truely a “dead” cylinder, you bury it, be sure you check your local laws on graves and burials.
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