recently there has been a hissing sound from my skunk 2IMat idle, its coming from the black tube that is connected at the top of the manifold and to the head. I twisted the tube and it stopped the noise. Is this bad to have it slightly twisted?

 

It was probably loose and sealed itself by twisting. Just replace the hose or clamp it securely if it's leaking from where it connects.

 

skunk2 IM are known for their hissing. mine does it as well.

 

Clamp the hose. Check your idle and your vacuum gauge for leaks if you have one.