... my 93 and the 92 both have one ground wire per connection...
Those single wires are supposed to represent power grounds on one bolt and signal reference grounds on the other. Here's a picture revealing how one wire you see is the join of multiple wires under the black vinyl sheathing.

There have been reports here of folks fixing these splices to resolve sticky troubles. Hasn't happened to me though.
All of the engine management grounding returns to the intake manifold, which is bolted in 8 places to the head, and back to battery negative through the head bolts to the block. All meant to be very reliable connections.
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Art Benstein near Baltimore
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