Normal rpm while idle 5.2 dodge durango?

After a list of problems with my durango I think I finally got her fixed but when in park the rpms are about 600 it does shift a little with the a/c is on but no puttering or smoking or other unnormal sounds. Is this the norm or should I keep troubleshooting. I am thinking to replace the tps maybe battery check but if I don't have to and this is normal then I will let it be.
 
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