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Hope this helps My 2004 Dodge Caravan is doing the same thing. The engine light came on a week ago. Van drives fine at 55-60mph. I tried the cleaner in the gas tank first. I got the codes by doing the on/off/on/off/on thing. Codes that showed up were 300 and 303. One is misfire and other is multiple misfires. Plugs and wires look fine. Appears to be coil. Hope this helps you.

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Q: 2004 Caravan check engine light is on and van is sputtering Thought it might be moisture and added anti-moisture agent to fuel seemed to make it worse what could it be?
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