Q: Car is backfiring - 1994 Dodge Ram 1500

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Well my truck backfires when it gets up to 60 to 70 mph only than after that it keeps backfiring and losing power (but not when the engine cooled ) when the engine heats up , I replaced the spark plugs, (spark plugs turning white and the spark don't like they 're burning gas )and wires thinking it was that than took off the muffler thinking it was that(before that the muffler was having white smoke with water , that's the far as I got
My car has an automatic transmission.

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