2012 Chevrolet Sonic cruise control problems

Car accelerated on it's own in drive and reverse causing my husband to hit a fence in drive and hitting a tree in reverse, he was driving on a city street, no one seek any medical treatment, called the police when he got home and made a report but do not have it on hand.

Current mileage is 26,985 1. Car seems to lose power when accelerating and hesitates (almost shutting down), it happens randomly while driving as well and is now happening more and more often. It' very dangerous when crossing intersections or making a right on red and especially dangerous when accelerating to enter a highway. 2. Rear suspension makes strange noises upon backing up/stopping; 3. Very bad odor coming from A/C vents....disgusting, almost smells like plastic burning or burning rotten eggs; 4.