15 at idle?? Should be closer to 20.......

 

I just found the culprit i believe well a combination i knew the brake booster had a small leak has for a year or so but i had my daughter start it so i could look at the engine cause the noise goes away rather quickly and doesnt whistle or hiss like most leaks but the driver side top valve cover gasket is bad about a whole inch on top right by the alternator when it runs for a few seconds it quickly quiets down but its a massive leak luckily i have the felpro driver side from changing the passenger side an engine ago so off thursday gonna rip her apart and maybe a brake booster but they work fine still