I have a v6 Dakota that idles ruff in the morning and idles better when warmed up. I can watch rpm move up and down a little and fills like misses going down hwy. My truck has had a resent tuneup everthing replased, plugs with proper gap,wires,rotor button and cap. egr was also cleaned and no vac leaks, check engine is not on and no codes. Thanks for any help

 

It may just be a bad coolant temp sensor. There are 2 of them. For locations check the FAQ in this section just a few posts above this one.