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If you have not checked and/or recently cleaned your fuses I would do that. My '81 GL was acting similarly, loud pump sounds and lousy performance with erratci missing or dead spots. Even after new pumps and some cleaned connections the missing still occurred, only a little less. New fuses and a few more cleaned connections seems to have solved the erractic missing and may have reduced the buzzing.
The fuses in my car didn't look all that bad to me or I might have started there before replacing pumps.
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