Hey dude can I see your engine video ? I have the same cam and at 2000 rpm is whistle . At idle is shakes so I want to make sure it's ok.
Did you degree the cam? Is it tuned? i would nt worry about the whistle, my first GT did and it seems common in cammed mustangs. As far as the idle, its cammed get used to it, lol. As long as it runs good i would nt worry.
would nt worry about it then, could just be your throttle body i know mine does that when i first get on the gas