I would definitely not take the suggestions lightly about using 92 or higher octane. Consider it insurance that you won't burn holes in your pistons. It's a small price to pay to make your car run right.
Bad cap, rotor, plugs, wires would cause pinging too.
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'91 LX convertible , T-5, Centerforce Dual Friction, MSD Blaster Coil, FR 9MM wires, 13* timing, 1.6rr, ported/polished/milled stock heads, 1.94/1.60 stainless valves, March Performance Pulleys, K&N panel, 1"spacer, BBK shorties, 2 1/2" off road H, Summit 2 1/2" catback
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