Seems like all of the GM small cars and trucks from that era have the same evap canister problem. My 1997 S10 throws that code from time to time. I've seen it in Cavaliers from the same era as well.
I've looked into fixing it, but nobody makes a replacement canister, and it probably isn't venting much (if any) fuel to the atmosphere. Mine comes on maybe 4-5 times a year, usually on a 1/4 tank or less. I clear it and life goes on for a few months.
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