Rough Idle- 2005 Liberty

I have a 2005 Jeep Liberty that suddenly started running rough, I gave it a Tune-up and it still ran rough . I took it to the dealer for a diagnostic and was told that they can not find anything wrong with it and that Jeeps usually run rough any-way. Has anyone else had this problem?

I have an 04. It idles kind of rough, I think around 1000 RPM. Have you ever had an engine light problem?

perform cylinder leak down test most likely it needs a head and vaulves its actually a comen problem with the 3.7 liter. take it back to the dealer and tell the to do their job right an also have them monitor misfires on it don't let them bullshit you the know there is a prblem with the 3.7 and the 4.7. you probley have some type of warrenty and they are trying to blow you off. i know because i work for a dealer and in about 4 hours the total job can be done