What to do if one cylinder is not firing on a 1989 Honda civic si?

The first thing to do if one cylinder is not firing on a 1989 Honda Civic SI, is to disconnect the battery. Then remove the spark plug wire and the spark plug. Check to see that there is no oil on the plug and it has the right gap measurement. Then replace the spark plug and wire and try the engine again. If it is still misfiring, change the spark plug. If that does not fix the problem, have a compression check done for that cylinder.