Sounds like you check the obvious things such as sticky linkage. If you're sure thats fine and it started happening while you were driving, I'd say your driver's side motor mount is broken. The motor will torque over and jam the throttle wide open.

I can't think of anything else that would make the carb rev up, seeing as you didn't touch anything before it started happening. If the accelerator pump were blown I'm pretty sure you would have the opposite affect. Also, I am not aware of any throttle solenoid..

Check the motor mount. h <img src="/forums/images/graemlins/kewl.gif" alt="" />