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Why does a 1993 Pontiac Grand Am 3.3 automatic stutter before going and sometimes backfire when you press on the gas?

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2004-10-01 09:12:40
2004-10-01 09:12:40

Assuming engine is in good condition and properly tuned and maintained.The mass air flow sensor is dirty.This causes an in-accurate measrure of air flow and in-correct amount of fuel delivery.

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A backfire is caused by a misfire... a cylinder fails to ignite the fuel which may cause a stutter, it may also cause a back fire due to it pushing that un-ignited fuel into your manifold where it then ignites from the heat of the other cylinders and boom you have a backfire...

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