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alot of things can. Something is causing the plug to fire while the intake valve is open. check plug wires to see if one is arcing across to another. (check on a dark night) carbon tracks on inside od dist. cap usually go from one term to another, Checj timing. timing chain/belt may of 'jumped' a tooth or two.

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14y ago
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Q: What causes a 1992 dodge Dakota 3.9L to backfire?
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