Chevy Lumina, CONSTANT backfire

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I have a 1990 Chevy Lumina, 4 door, 130,000 miles, I dont know anything else about it. When I accelerate too fast, it backfires until the RPM's lower. I can get up to any speed accelerating slow, its just any medium acceleration causes 3-10 backfires. This problem seems to happen when it rains, its the second time this happened. I found a leaf in the air filter but it was fine. Thank you

posted by  Stimpack21

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