How many miles on the car?

When was the last time the following were change?
Spark plugs
Ignition Wires
Distributor cap
Distributor rotor

Were genuine Honda parts used? Or did you go the cheap and
less reliable route and use aftermarket parts?

Has any work been done on the coolant system recently? What
is the level of coolant in the reservoir at cold engine, and
at hot engine?

After the above are eliminated, I would suspect the oxygen
sensor.