'97 EX (auto)
I, too, have similar symptoms with a tapping/knocking noise during normal acceleration. Mine occurs more so during the upper rpm just before the gear shift. I have changed plugs, but that only made a slight difference. I have tried different fuels but to no avail. Is it possible the timing is off? I have not read anywhere in my haynes (door stop) manual where to adjust the timing. Otherwise, I'll just replace the next cheapest thing or live with it.