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Most likely you are in need of a tune up. When distributor caps and spark plug wires get old, they can leak and in wet or damp weather, the spark intended for one cylinder can jump to the wrong terminal under the cap or from one plug wire to an adjacent wire, sending spark to the wrong cylinder at the wrong time. If it won't start and it's dark,sometimes you can look under the hood and see the spark jumping around where it doesn't belong (to ground-the motor). Change the cap, rotor, wires, and plugs and you should be fine.

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16y ago
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Q: Won't start in damp weather 2003 dodge ram 2500 with 5.2 liter motor backfires?
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