07 charger

Weird problem that I have not even Googled yet. 07 Charger with 50,000 miles. 5.7 sho engine. After running normal for a few minutes, the engine backs down to 45 mph regardless of how much accelerator is pressed. Transmission stays at about 3000 rpm. It did this last night to my son, and I recreated the same results today.

The engine light is on, and I will be bringing to a shop tomorrow. I was just wondering if any of y'all have heard of this problem.