Oldsmobile Vehicle Speed Control Questions

My 2003 OLDS ALERO accelerates on it own. At times I ...

My 2003 OLDS ALERO accelerates on it own. At times I have a hard time getting it to stop. When I let off of the break the vehicle will acclerate up to about 40 mph without even touching the gas pedal. When it does this, I stop and put it in park, then while in park it shoots up and idles at 3-4 rpm.

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02 Olds Aurora... gas pedal sticks and usually happens when I start my car and put it in gear push on pedal nothing happens then all of a sudden car jerks like I'm taking off in an angry fashion.. I have had other problems with this car as well..