’00 Civic Rough Idle on Cold Start

Hi Guys,
Hope you can help me again, my 2000 civic ex 53K miles is experiencing a rough idle upon start up. No check engine lights and other than that car runs great. Car responded very well to a WOT today. All routine maintenance items are up to date. Last maintenance performed was a radiator flush and fill. I did it exactly as Eric says in his videos.
Thank you