Cruise Control problems of the 2002 Chevrolet Cavalier

I drove my 02 chevy Cavalier on Thursday back from tahoe,CA and my gas pedal got stuck down and kept increasing in speed, so I prayed and then started to mess with my cruise control and finally came back up, this morning same thing happened, so I called Chevrolet customer service and the rep-eric told me that I need to pay for a diagnoses before I can get any answers, he called up the closest dealer and they could not give him a quote, I would rather buy a new car if I have to pay money for a diagnoses. This incident is a mechanical problem which occurs on its own. I cant afford another car as of right now and am still using my car for work. What would you say I should do??.

Cruise control stayed on after hitting breaks even tried swtiching it off and that did not work only when I pressed in on the clutch did it disengage. But not befor the engine reved up to over 5000 rpm. This could damage the engine.

While traveling on interstate I-75 at approx 75-78 mph with my car's cruise control set, I changed lanes to go around a slower vehicle at which time I was also coming up to a vehicle in the lane I switched to so when I tapped my brake pedal to release the cruise control it did not disengage, so I rapidly starting pushing the button on the end of the cruise control mechanism which did not slow me down either-I turned the button of on the cruise control it did not shut off! I got over into the slow lane to prepare to exit the x-way by literally standing on my brake pedal and I could only get it down to about 58 mph with my rpm's still at over 3000 when I exited I got the front end of the car to the shoulder I was going to fast still to properly place the car and I decided I needed to put it into neutral and shut it off, I missed neutral and went into reverse at 58-60 mph it jolted us backwards I quick reached down and put it back into drive and we flew forward and at that point I crammed the gear shift into park at 60 mph- my engine was roaring and you could smell nothing but burning. My father drove to where we were and since he is retired g. M. Repair person he knew how to disconnect the cruise control cable and he had me follow him and said everything seemed ok- I now have gotten the car to team hodges Chevrolet where it was purchased for them to inspect and a report has been made to Chevrolet.