1999 Chrysler Concorde Throttle position sensor or starter?

1999 Chrysler Concorde LE- It acts sluggish when changing gears and taking off. It sometimes stalls when I come to a complete stop or make slow, hard turns. My cruise-control wasn't working for a while; now it's working again, but won't maintain the set speed (doesn't compensate for hills and stuff). If I floor the gas pedal it doesn't get up and go; it slowly builds speed. When it is idling, it sometimes surges up really high.