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Q: rpms running high on highway on 2006 Dodge Ram 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
for starters my engine light is on,but if I drive on the highway for 15 or more minutes my rpms will randomly jump to 2100 rpms and hold for a second or two then go back down and will repeat every couple minutes until I get back down to city speed limit.
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