A few seconds it smooths out and purrs. This happens mostly when very cold sometimes when just cold never in warm or hot weather. I live in Virginia. Any ideas, please??

. Test all of the glow plugs.
. Purge water, change fuel filter.
. Use full-synthetic HDEO.
. Link below should help:

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