I HAVE A DODGE RAM 15OO 2003 WITH 70,OOO AND I JUST NOTICE THIS IDLING PROBLEM THIS MORNG WHEN MY TRUCK WAS COLD I STARTED AND THE RPMS WHEN HIGH TO LOW AND SHUT OFF PLEASE HELP THERES NO CHECK ENGINE LIGHT ON
Could be many different things. I would look at cleaning the throttle body and idle air control valve or replacing your filters if you haven't in a while. Also look for a vacuum leak.
Search Dodge Ram 1500 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Dodge Ram 1500 Experts