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Q: replaced fuel pump, but now it backfires an won't idle on 1990 Buick Skylark

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
it ran fine for about 5 to 10 minutes then started this problem, also replaced the fuel pressure regulator, but same thing, it did help.
why is it doing this, any ideas?
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