Have a 96 7.3 turbo powerstroke that idols deceint when cold but a little rough when warm?

I could be the hallmark of a worn and tired fuel pump. Ensure oil is full and has been changed recently. I only recommend Motorcraft filters on PSDs. This can be important, since the condition of the oil and the brand of oil filter can affect fuel pressure.

This link may help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-8.html#post1415281