Lots of possibilities.
Fuel seems the most likely problem.
I have seen everything from lack of gas tank venting, to leaky fuel injector.
Installing a fuel gauge will tell if there is a leaky injector, because pressure will drop too fast when you shut down.
Unscrewing the gas cap will show a lack of venting if you hear rapid sucking sound.
Other possibilities include overheating or vapor lock.

When the "check engine" light goes on, that should be stored and be possible to read back with and inexpensive tool.

The whistle noise seems normal from the turbochargers.

--- In enricosmaseratipage s@yahoogroups. com, "IronMan" <eduardo.nuno@ ...> wrote:
>
> Hi there everyone.
>
> I'm a portuguese guy and i've recently bought a 2000's 4200GT.
> Is a great car and althought i'm used to rebuild and doing maintenance
> on other big cars (Jaguar, BMW, Rolls Royce, Mercedes...) , this one is
> completely new for me. A V8 twin turbo... a men's dream.
>
> The first thing i've notice is that it is a hell of a car with a hell
> of an engine. In fact it scared me! I use to ride a motorcycle too and
> has been a long time a didn't felt such a rush of adrenaline!
>
> I didn't had the time of doing a intensive check up on the car but
> i've the sheet of the official garage maintenance done 5.000 km ago.
> So, i've pushed it a bit and i've notice some kind of strange noise
> when i push the trottle hard. It's like a low frequency whistle like
> the wind passing trough a chimney.
> Since i don't have any other to compare with,i would like to ask if is
> this normal?
> I really think there's some problem with the air filters, but...
>
> Other anoying thing was, for two times, when stoped on the traffic
> lights, the engine just shuted down and it took about 20 minutes to
> start again.
> During that, the "check engine" warning light was on and even after 10
> minutes after start it was still on. Then it went off and everything
> was back to normal.
> This makes me affraid of getting stalled in the worst of the
> circunstances. Does anyone knows how to diagnose the fault?
>
> I hope to be welcome on such esquisite club of owners.
> Congratulation to Enricos for his fantastic web site and cumpliments
> to all of you!
>
> Thank you!
>