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Q:

whys my truck idol up in cold weather while driving, and when started sometimes. on 2003 Dodge Ram 1500

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I'm thinking TPS (throttle positioning sensor) or crank shaft sensor. Only happens in cold weather while driving down the road. 4.7L 190,000 miles. never had a problem other than water pump and wheel bearing. Been well kept.
(2) Answers
When cold it SHOULD go to a 'fast' idle(1500-2000RPM) for maybe a minute or two. Have Idle Air Control valve checked for proper signal and function.
Your truck has an Idol?