96 would be earlier than the HPTuners software that bill uses will support.
since it is OBD2 bill should be able to scan and view it though, at least give you an idea of where to look.
you replaced the plugs as well as the wires or just the wires? i am not sure how opti spark is set up exactly, but a multi cyl problem could be a sign of a dying coil or loose coil connection.
later
tim
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