Thats the one, thanks antp. I just watched it again, what a terrible film. What a difference 20 years make.

This one?
http://www.imcdb.org/movie_82199-Condorman.html

I have seen a film when I was younger it was probably around the mid 80's, I believe it was about a superhero of some sort associated with some kind of bird. From what I remember it had either a yellow or green Corvette or Trans-am that the main character drove. He would disguise it in this old caravan shell, from which the car would emerge when he had to engage in a car chase with the baddies. Its also vague but I think the villains drove three or more black Porsche 911's.

I looked at all the corvettes in main character rolls on the site, but I couldn't find anything to what I remember. Any help with this would be greatly appreciated.

Thanks, Chief