Do you mean the rotor in the dizzy? That was my first idea. Like the rotor is still touching the cap and firing a spark plug. well something like that anyway...
there is a plastic piece in most honda/acura distributors that over the ignitor... maybe its came loose and is smacking the rotor button or maybe your rotor button is loose... ive seen all kinds of shit that you wouldnt expect and it wound up being that.