Could it be a fuel pump or?

1990 CADILLAC ELDORADO
199,000 MILES
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ARMYGUY93
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My car backfires when pushing the gas to much and is running at a high rpms and is getting 6 MPG it runs really slow its a 1990 Cadillac eldorado
Jan 26, 2012 at 5:48 AM
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RASMATAZ
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It sounds like you have a plugged cat converter, go here to check

http://www.2carpros.com/articles/how-to-test-a-catalytic-converter
Jan 26, 2012 at 7:12 AM