I have a 2001 Durango with 4.7 . I'm getting coil pack codes ,different ones after clearing them ,it has new spark plugs ,new coil packs . It runs good at idle ,but from 1000 rpms to 2000 it hesitates and throws a code or two ,but if i get it over 2000 rpms it runs really good and no codes . I'm stumped
Thanks

 

What codes?