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