Hondata

I've been experiencing an annoying vibration at idle (things rattle) and thought somebody might be able to give me some pointers on what might be going on. The idle is smooth when the car is warming up, but when the revs finally settle around 8000 things get rough. We're not talking about severe vibration - just enough to annoy and rattle parts. I don't remember having this issue when I first reflashed the ECU. I was hoping I get could some ideas on what might be at fault and/or some potential solutions. I read through various idle-related posts on this board, but I didn't find anything definitive. Your advice is much appreciated!

Dave