Hi,
Not being there makes it difficult for me to be certain, but based on the issue, I would at a minimum remove the spark plugs for inspection. See what condition they are in. If they appear worn, I would replace them with the spark plug wires, distributor cap, and rotor button.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-tune-up-a-car-engine
Also, if you remove them, take a few pics of them, and upload them for me to see.
Let me know.
Joe
Tuesday, October 3rd, 2023 AT 7:06 PM