I have a 2006 Scion Xa that tried to kill me

I have a 2006 Scion Xa that tried to kill me today. SERIOUSLY. I had cruise control on and was doing 70. Turned cruise control off as I entered a mid size town and WTF the car wouldn't idle below 60mph. I tried turning the cruise control on/off multiple times and tapped the brakes. It was like cruise control was on and stuck at 60mpg. I slowed it down using the brakes with the RPMs screaming higher and higher like the engine was going to blow. STANDING on the brakes and the car was still trying to inch through the intersection at the off ramp. Finally lurched to a stop and turned the car off. Tried turning it back on and immediately the engine RPMs screamed up like it wanted to shoot off at 60mph. I stared horrified at the building in front of me with its plate glass windows. Sigh. Called Toyota and the toyota tech said to tap the gas pedal a couple of times - that maybe the throttle was stuck. I went to the car and SLAMMED on the gas pedal a few times. Started it back up and WHEW my sweetie was back. The possession was over. Yes, I've already seen the service bulletins on the cruise control (but I thought sweetie had that checked during two oil changes ago)... Has anyone experience a similar SCARY incident? Could it be a stuck throttle cable? Or could the cruise control truely take TOTAL CONTROL of the throttle. See, I toggled the cruise control on/off numerous times and so it should have released according to the service bulletin. Anyway, little miss bit is having her parts checked out.