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Sounds like the van is misfiring on one of the cylinders. Best advice, take it to a garage and ask for an inspection, if you live in a state that has mandatory yearly inspections you could ask the mechanic during the inspection is it is misfiring. That or spark plug wires, but that's kind of a hit or miss. Hope this helps.

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Q: 1999 Dodge Caravan 3.8 L engine idles rough and backfires at a certain rpm does not do it all the time any suggestions would be greatly appreciated?
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