Alternator/generator/regulator problems of the 2009 Dodge Avenger

2009 Dodge Avenger rpms would rise and fall 200-300 at idle. Exhaust/muffler would rattle. Have been to multiple shops and they cannot diagnose the problem. It is taking longer to start up. The alternator was replaced 2 months ago. The battery was replaced last week. Yesterday, it was checked by an autozone employee for codes and nothing came up. I started the car and it quickly died there after. Drove it around all day after that and not a problem. Today it had a very rough start, rpms went above 2000 and back down to about 400, constantly, and car was shaking a lot. I backed out of the garage and while I applied the brakes, it almost died. I barely got it in park before it did die. The whole time the check engine and etc lights stayed on. This is a first for both to stay on. Etc has came on before and stayed, then never showed up for another 1-2 years (now0. Car has almost 87,000 miles.

The contact owns a 2009 Dodge Avenger. The contact stated while driving various speeds, the vehicle suddenly lost acceleration power. The vehicle was taken to a private mechanic where it was found that the throttle body and alternator had failed. The vehicle was repaired. The failure mileage was 105,000.