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It is out of time. You can bend a valve when it backfires through the intake so careful till you find cause. Perhaps belt or chain has jumped a tooth. Go to www.autozone.com and click on repair info and enter vehicle and click on repair manual and a manual for your car will come up and its free to use. Also autozone rents a compression tester for free(get money back when return it). Easy to check compression each cylinder so I would start there. Hope this helps

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Q: What causes a 1996 Olds Achieva 3.1 to backfire through the plenum?
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