I have an erratic idle 1997 honda accord 4 cyl. "non vtech" only in neutral or park, once I put it in drive it goes steady. Then if I put it back in park it is stii okay until I rev the engine then it get erratic again.this happens hot or cold. But when cold it is more intense.

These links should help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-7.html#post1054149

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post260436