Hi, i own a 2005 Dodge Durango 5.7 and i have noticed that after started it drops immediately into a very steady 700 RPM idle, and all of my other cars rev a little high (somewhere between 1000 - 1200 RPM) is it normal for my Durango ???

 

Yes. My wife's is a 4.7, but after the initial start up it usually settles down to around 700 RPMs.