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Replaced fuel pump, but now it backfires an won't idle

(1990 Buick Skylark)
in Wytheville, VA on April 12, 2009
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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Popular Answer
on May 29, 2009
Did this ever get resolved, and if so, what was the problem? Thanks!
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