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Bad plugs, wires, or even coil packs. Auto Zone will read your engine codes for FREE... If it's the plugs or wires then change them both. Don't be cheap you will regret it in the long run. to change plugs and wires it takes around 4 hours or so. Been there & done so.

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Q: What causes a 1999 Ford Expedition to backfire while accelerating?
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