Does any one know where this noise is coming from???...i bent my valves 3 months ago, due to mishifting 3rd to 2nd, and started doing some noises around 2500 to 3000 rpms, misfiring and kinda of like its whistling...now i took my car in the shop and got the head done with some pnp and valve job,springs n retainers, new cams and after i got it it's still makes the same whistling noise,but the misfiring is gone like its back from normal but im sick of that noise and im scared something might go wrong agen... a guy i kno said i need some new intake manifold gasktet but i dunno, if it is the manifold gasket, can someone help me??

 

If it is at a certain throttle position, it is the gasket on the idle adjustment screw.