2003 Dodge Durango 4.7 rebuilt front to back top to bottom New crankshaft position sensor, new camshaft position sensor, new tbps, new IACV and new air temp sensor I clean the TB and it still stays at a constant 1500 rpm and no air leaks that l can hear what else will cause a high idle

 

I'd guess an air leak you can't hear.

 

I'd be suspect of an air leak still or a cheap parts store IAC that doesn't work right.