Conversation Between Compusmurf and martica6731@gmail.com

I'm new in this forum and I need advice and guidance..I have a 2006 nissan maxima.I've noticed that when I drive it 20 mins or more the Rpms go from 1 to 4 when im driving I was told it could be my sellinoid..I don't know a thing about that kind of things..Please if you can tell what does that sound to you?
Thanks.