Kinda scary

Black smoke is caused by flooding, tons of fuel was being dumped into your engine by the stuck throttle. It's unlikely it caused any permanent damage (other than possibly fouled spark plugs), although in the future you should shut the engine down more quickly at signs of trouble. I'm sorry I can't offer any specific advice from my experience, but I'm that sure others here may be able to help more specifically. Fuel injected 2V car I'm assuming?

 

Lots of time the rug/carpet will push the gas pedal forward and cause it to rev high. Check and pull the rug back away from the pedal and see if that helps, if not, check the throttle linkage an see if it's binding somewhere. Also, if your cable has a broke strand, once it enters the cable housing, it will resist it from going back.

 

http://www.ferrarichat.com/forum/showthread.php?t=338038, read this thread the other day, might be worth a look, re pedal bearings.

 

I had a problem with my throttle too and some gave advice for the carpet but tought it couldn't be that. Well it was the carpet indeed. I couldn't believe it was a so simple problem.

 

I came across Birdman's mat grabber the other day whilst looking up something else. It appears to prevent the "Italian Cruise Control" with a very simple device.

http://www.birdmanferrari.com/mat_grabber.htm

 

The mat grabbed my pedal on another car so many times I took the mat out. Would rather wear the carpet out than crash.

 

I did the same on my car. Like the stock look anyway.

And I say this every time there is a malfunction. Please, if you have a malfunction, shut it down and get it towed. There is a lot of financial risk in pushing these cars in a way they are not meant to be driven.