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one fo the things that the older GM computers all had in common was to dump fuel as a solution. look at your plugs and see if they are all junked up. if they are start checking some of the simple/obvious sensors. the water temp for the computer is a good one for silently going bad and causing headaches.
i woudl also check to see if the wiring for the O2 is good. those connectors can get humidity into them and corrode fairly easily after 15+ years of use.
good luck with it.
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