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Did you ever check the rest of the spark plug wires? I had a spark plug wire come loose on #6 after a long highway trip. Idle instantly went to ***** and it missed really bad at low RPM. Give each of the spark plug connectors a firm push to make sure they are seated all the way.
And yes, 91 did have the dual fuel pump setup. If you haven't changed the fuel filter in the last 30-40K I would do it anyways. It's easy and cheap.
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