Hello, I just got a 2014 Ram1500 5.7 and when I test drive it everything seems really smooth and runs great. after buying it, the next morning when I took it to work the rpms started to go up and down slightly and it happened every 3 seconds and when it changes from 3-4-5(gear) I get slight vibrations. once the truck is been running for about 5 miles everything goes away, it’s runs so smooth, I already spend $1300 on 3 different places( dealer and 2 transmission places) they told me that they can’t find any problem, one place they actually took it apart and couldn’t find anything, Any suggestions what this could be? Thank you.
Sorry my English is not my first language.