Had the same problem last week after my car had been sitting for a good month or two. A can shouldn't be anymore than $4.00. Take off your intake and spray the F out of it, clean excess residue with a toothbrush. Once everything is put back together it will take a good few minutes for the car to fire up, don't let it worry you, you should be good to go after that.

 

Have you reset ECU?

 

I'm having the same problem too. I just tried resetting the ecu this morning and it actually made it worse.

 

It could be any of a number of things, including but not limited to: Bad idle air control valve; bad idle set screw setting; bad afm; ecu issues, etc., etc., etc.

Get the Honda shop manual, and work your way through the trouble-shooting sections. It's a pretty good manual, as these things go.