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I have a Mazda 626, 1999 LX. It idles fine, and if you give it gas very slowly it accerlates fine. But if you tap the gas fast or press the gas to speed up, it jerks and sputters and yesterday it would pop like a small backfire. The indicator light that looks like an engine came on yesterday and won't go off. The owner manual says that means fuses or electrical problems. I checked all fuses that you can check visually. They were ok. Now what? Could it be the O2 sensor?