No power going uphill, hissing sound from engine and check engine light turned on?

When driving up to a summit the vehicle lost power going uphill and a hissing sound started from the engine when trying to accelerate. The check engine light came on. After pulling over and checking the engine, I noticed this part that looks fried and have no idea what it is. I was able to make it home, but it continued to hiss and lag when accelerating. I recently had 2 ignition coils replaced. Any help would be appreciated.