Could anyone help me out with this problem? My car is 99 Accord LX Coupe V6 (J30A1 Engine). Recently it will occasionally stall about once a week, usually after 10-15 mins after a cold start. I asked a mechanic to clean the throttle and injector, and also changed spark plugs. However this problem still happens sometimes.

The idle RPM is 1000 after cold start, and then slowly goes down to about 700. Could it be IACV (idle air control valve)?

I know there's a recall on ignition switch in 2002. I checked on Honda's owner link website. It shows the status is fixed. Probably the previous owner had it fixed.

Any ideas what it could be? What else could I check?

Thank you for any help.